Friends: Roberta Flack Sings Mariko Takahashi

Smooth soul is a polished, romantic strain of soul music defined by velvety vocals, lush string and horn arrangements, and immaculately produced, mid-tempo grooves. It maintains the emotional directness of classic soul while softening its edges with gentle rhythms, extended jazz-tinged harmonies, and spacious production. Emerging in the early 1970s from the same currents that produced Philadelphia soul, smooth soul favors elegant orchestrations (strings, woodwinds, muted brass), silky electric pianos, and clean guitar tones. Lyrics typically center on love, intimacy, and adult relationships, delivered with controlled intensity, falsetto flourishes, and refined background harmonies. The genre provided a bridge from 1960s Motown and Southern soul to quiet storm and contemporary R&B, shaping radio formats and a lasting template for intimate, late-night soul.

Soul is a genre of popular music that blends the spiritual fervor and vocal techniques of African‑American gospel with the grooves and song forms of rhythm & blues and the harmonic palette of jazz and blues. It is defined by impassioned, melismatic lead vocals; call‑and‑response with backing singers; handclaps and a strong backbeat; syncopated bass lines; and memorable horn or string riffs. Typical instrumentation includes drum kit, electric bass, electric guitar, piano or Hammond organ, horns (trumpet, saxophone, trombone), and sometimes orchestral strings. Lyrically, soul ranges from love and heartbreak to pride, social commentary, and spiritual yearning. Regionally distinct scenes—such as Detroit’s Motown, Memphis/Stax, Muscle Shoals, Chicago, New Orleans, and Philadelphia—shaped different flavors of soul, while the style’s emotional directness and rhythmic drive made it a cornerstone of later funk, disco, contemporary R&B, and hip hop.

Vocal jazz is a jazz tradition in which the human voice is treated as an instrument—matching the phrasing, articulation, and timbral nuance of horns or piano. Singers often improvise melodically and rhythmically, including using scat singing (nonsense syllables) to emulate instrumental solos. At the same time, many vocal‑jazz performances favor traditional, pop‑leaning song structures and clear lyric delivery, reducing the overall role of extended improvisation compared with small‑group instrumental jazz. Repertoires frequently draw from Tin Pan Alley and Broadway standards (the Great American Songbook), rendered with swing, ballad, or Latin feels.