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Instrumental death metal is death metal that omits vocals entirely while preserving the genre’s defining sonic traits—downtuned and highly technical guitar work, rapid double‑kick and blast‑beat drumming, dissonant harmonies, and volatile dynamics. Without growled vocals as a focal point, the music shifts toward compositional detail: intricate riff architecture, lead‑guitar counterpoint, bass virtuosity (often with tapping and chordal playing), and drumming that toggles between surgical precision and controlled chaos. Many bands draw on progressive metal, djent, and jazz‑fusion language, favoring odd meters, rapid metric modulation, modal mixture (especially Aeolian/Phrygian flavors with added chromaticism), and tightly gated, ultra‑articulate production. The result is music that feels as heavy and extreme as traditional death metal but reads more like an instrumental narrative—riff suites, thematic development, and textural interludes substitute for lyrical content.

Jazz metal is a hybrid of jazz’s harmonic language and improvisational ethos with metal’s amplified intensity and rhythmic power. It typically blends distorted guitars and aggressive drumming with extended chords, modal harmony, walking or fretless bass lines, and passages of real-time improvisation. Many bands adopt progressive song forms, odd meters, and polyrhythms, toggling between heavy riffs and spacious, clean-toned jazz interludes. The result is a technically demanding, cerebral style that can range from atmospheric and fusion-like to extreme and abrasive.