Billy Cobham, 'Spectrum' (1973)
What a weird cultural blip fusion was. Chalk it up to copious recreational drug use or free-form radio programming, but the early-to-mid Seventies were a heyday for electric jazz-based improv, all thundering polyrhythms and twisting solos. Released in 1973, drummer Billy Cobham's trippy, aggressive Spectrum is a favorite from that era. Listen to squiggly complexities like "Taurian Matador" and "Quadrant 4" and marvel at how unlikely it was that this music was legitimately popular (Spectrum hit the Billboard Top 30).