EMI–Odeon S.A.I.C.

Acoustic rock is a style of rock music built primarily around acoustic instruments—especially steel‑string acoustic guitars—while retaining rock’s song forms, rhythmic drive, and hook‑oriented choruses. Compared with folk or traditional singer‑songwriter material, acoustic rock tends to use stronger backbeats (often played with light drums or hand percussion), more prominent bass movement, and dynamic, chorus‑centric arrangements. The result is a warm, wood‑toned timbre with the energy and structures of rock, but without the distortion and heaviness typical of electric guitar‑led styles. The genre spans intimate solo performances to full‑band “unplugged” settings, often featuring strummed open chords, fingerstyle passages, vocal harmonies, and occasional alternate tunings or capo use to shape color and register.

Alternative rock is a broad umbrella for guitar-based rock that emerged from the independent and college-radio scenes as a counterpoint to mainstream, commercial rock. It blends the energy and ethos of punk with the textural and songwriting experiments of post-punk, new wave, jangle pop, and noise rock, often foregrounding introspective or socially aware lyrics. Across its many strains—from the melodic minimalism of college rock to the loud-quiet-loud dynamics of grunge and the artful experimentation of Radiohead-era modernism—alternative rock prioritizes authenticity, sonic individuality, and a do-it-yourself approach. Its sound ranges from chiming, chorus-laden clean guitars to abrasive distortion and feedback, supported by straightforward rock rhythms or off-kilter grooves, and production that can be either raw and live-sounding or polished yet unconventional.

Latin (as a genre label) is a broad umbrella used by the recording industry to categorize popular music rooted in Latin America, the Caribbean, and the Iberian world, often characterized by syncopated Afro-diasporic rhythms, dance-forward grooves, and lyrics primarily in Spanish or Portuguese. As a marketplace category that took shape in the mid-20th century United States, it gathers diverse traditions—Afro-Cuban, Brazilian, Mexican, and Caribbean styles—into a shared space. In practice, "Latin" spans everything from big-band mambo and bolero ballads to contemporary pop, rock, hip hop, and dance fusions produced by artists of Latin American heritage.

Latin rock blends the instrumentation and attitude of rock with Afro‑Latin and Caribbean rhythms, percussion, and song forms. Typical bands combine electric guitars, bass, and drum kit with congas, bongos, timbales, and hand percussion, creating a driving, danceable groove grounded in the clave. Vocals may be in Spanish, Portuguese, Spanglish, or English, and lyrics range from love songs and urban life to social and political commentary. Harmonically, Latin rock draws from blues/rock progressions but frequently incorporates modal colors (Dorian, Mixolydian) and montuno‑style vamps borrowed from salsa and Afro‑Cuban traditions. The result sits comfortably between club‑ready rhythm and arena‑sized rock energy.

Blues rock is a guitar-driven style that fuses the raw feeling and 12‑bar structures of the blues with the power, volume, and rhythmic punch of rock. It emphasizes riff-based songs, pentatonic and blues-scale soloing, call‑and‑response between voice and guitar, and an expressive, often gritty vocal delivery. Typical ensembles are power trios (guitar, bass, drums) or quartet formats adding second guitar, keyboards, or harmonica, and performances commonly feature extended improvisation. Sonically, it favors overdriven tube-amp tones, sustained bends, vibrato, and dynamic contrasts, moving from shuffles and boogies to straight‑eighth rock grooves.

Folk is a song-centered acoustic tradition rooted in community storytelling, everyday life, and social history. It emphasizes clear melodies, simple harmonies, and lyrics that foreground narrative, protest, and personal testimony. As a modern recorded genre, folk coalesced in the early-to-mid 20th century in the United States out of older ballad, work song, and rural dance traditions. It typically features acoustic instruments (guitar, banjo, fiddle, mandolin, harmonica), strophic song forms, and participatory singing (choruses, call-and-response).

Folk rock is a fusion genre that blends the narrative lyricism, modal melodies, and acoustic timbres of traditional folk with the backbeat, amplification, and song structures of rock. It typically pairs acoustic or traditional instruments (acoustic guitar, mandolin, fiddle) with a rock rhythm section (electric guitar, bass, drums), often featuring chiming 12‑string guitar textures, close vocal harmonies, and socially conscious or storytelling lyrics. The result ranges from intimate, reflective ballads with a steady backbeat to more anthemic, roots‑driven rock. Emerging in the mid‑1960s through artists such as Bob Dylan and The Byrds, folk rock became a gateway for traditional and roots materials to enter mainstream popular music, and it seeded later movements from country rock and Americana to jangle pop and modern indie folk.

Milonga is a Río de la Plata song genre that took shape in the late 19th century among gaucho singers (payadores) in Argentina and Uruguay, with a parallel presence in Brazil’s southern state of Rio Grande do Sul. It is widely regarded as a direct precursor to tango. Characterized by a generally slow, loping rhythm in duple meter (2/4 or 4/4), milonga is most often performed with voice and a single criolla (nylon‑string) guitar using bass‑line “bordoneo,” light syncopation, and habanera‑like cells. Texts typically use décima (espinela) stanzas and reflect rural life, love, solitude, and the vastness of the pampas. Note: Here “milonga” refers to the song/folk style (often called milonga campera), not the later, faster urban dance form of tango known as “milonga.”

Nuevo tango is a modernized form of Argentine tango that incorporates the harmony, counterpoint, and extended forms of Western classical music together with the rhythmic flexibility, improvisation, and ensemble language of jazz. Musically, it retains the dramatic phrasing, rubato, and accented articulation of traditional tango, but expands the palette with chromatic harmony, altered dominants, modal color, contrapuntal writing (often fugal), and more adventurous formal designs. Ensembles range from the classic orquesta típica (bandoneóns, strings, piano, bass) to chamber groups and jazz-inflected combos. While the musical current crystallized around Astor Piazzolla in the 1950s–60s, the dance interpretation called "tango nuevo" took shape in the 1980s, emphasizing open embraces, off-axis movements, and improvisational exploration aligned with the genre’s musical freedoms.

Progressive rock is a rock subgenre that expands the genre’s formal, harmonic, and conceptual boundaries. It favors long-form compositions, intricate arrangements, and virtuosic musicianship, often drawing on Western classical, jazz, folk, and psychedelic idioms. Typical hallmarks include multi-part suites, shifting time signatures, extended instrumental passages, recurring motifs, and concept albums that present unified themes or narratives. The sound palette commonly features electric guitar, bass, and drums alongside an array of keyboards (Hammond organ, Mellotron, Moog/ARP synthesizers, piano), woodwinds or brass, and occasional orchestral additions. Lyrics often explore science fiction, mythology, philosophy, social commentary, and introspective themes.

Rock is a broad family of popular music centered on amplified instruments, a strong backbeat, and song forms that foreground riffs, choruses, and anthemic hooks. Emerging from mid‑20th‑century American styles like rhythm & blues, country, and gospel-inflected rock and roll, rock quickly expanded in scope—absorbing folk, blues, and psychedelic ideas—while shaping global youth culture. Core sonic markers include electric guitar (often overdriven), electric bass, drum kit emphasizing beats 2 and 4, and emotive lead vocals. Rock songs commonly use verse–chorus structures, blues-derived harmony, and memorable melodic motifs, ranging from intimate ballads to high‑energy, stadium‑sized performances.

Tango is a song-and-dance music from the Río de la Plata region, crystallizing in Buenos Aires (Argentina) and Montevideo (Uruguay) in the late 19th century. It is characterized by a melancholic, dramatic tone; richly expressive melodies; and a distinctive rhythmic feel rooted in the habanera and milonga. Core ensembles feature bandoneón, violin(s), piano, double bass, and sometimes guitar, forming the famed orquesta típica. Across the 1920s–1950s it became a worldwide craze, moving from rough immigrant bars to grand salons and radio, developing highly sophisticated arranging and performance practices. Lyrics often employ lunfardo (Buenos Aires slang) and dwell on urban nostalgia, love, betrayal, and the neighborhood (el barrio). Note on terminology: in flamenco, “tangos” is a distinct palo (song form) with a lively 4/4 compás, often in A Phrygian, closely related in feeling to rumba flamenca. Although it shares the name and a spirited character, flamenco tangos is a different tradition from the Río de la Plata tango described above.