"Larks' Tongues in Aspic" showed several significant changes in King Crimson's sound. Having previously relied on saxophone and flute as significant melodic and textural instruments, the band had replaced them with a single violin. Muir's percussion rig featured exotic, eccentric instrumentation including chimes, bells, thumb pianos, a musical saw, shakers, rattles, found objects (such as sheet metal, toys and baking trays), plus miscellaneous drums and chains. The Mellotron (a staple part of King Crimson's instrumentation since their debut album) was retained for this new phase and was played by Fripp and Cross, both of whom also played electric piano. The instrumental pieces on this album have strong jazz fusion and European free-improvisation influences, and some aggressively hard-hitting portions verging on heavy metal.