Dave Martone

Metal guitar is a guitar-centric branch of heavy music that spotlights virtuosic lead playing, high-gain tones, and tightly synchronized rhythm parts. It emphasizes speed, precision, and advanced techniques (alternate and economy picking, sweep arpeggios, legato, tapping, wide vibrato, whammy-bar phrasing, and hybrid picking). Harmonically, metal guitar often draws on modes and scales with a dramatic edge—harmonic minor, Phrygian dominant, diminished and whole‑tone collections—alongside modal riffing (Aeolian, Phrygian) and pedal-point figures. Rhythm guitars are commonly double- or quad‑tracked, palm‑muted, and locked to aggressive drum patterns, while leads soar over dense rhythm beds with saturated sustain. Although it intersects with instrumental rock and many metal subgenres, “metal guitar” specifically spotlights the role of the guitarist as the principal voice, whether in instrumental pieces or guitar-forward band contexts.

Jazz fusion (often simply called "fusion") blends the improvisational language and harmonic richness of jazz with the amplified instruments, grooves, and song forms of rock, funk, and R&B. It typically features electric guitars, electric bass or fretless bass, Rhodes electric piano, clavinet, analog and digital synthesizers, and a drum kit playing backbeat- and syncopation-heavy patterns. Hallmarks include extended chords and modal harmony, complex and shifting meters, brisk unison lines, virtuosic improvisation, and a production aesthetic that embraces effects processing and studio craft. The style ranges from fiery, aggressive workouts to polished, atmospheric textures, often within the same piece. Emerging in the late 1960s and flourishing through the 1970s, jazz fusion became a bridge between jazz audiences and rock/funk listeners, shaping later styles such as jazz-funk, smooth jazz, nu jazz, and parts of progressive and technical rock/metal.