Reed Phase, also called Three Reeds, is an early work by the American minimalist composer Steve Reich. It was written originally in 1966 for soprano saxophone and two soprano saxophones recorded on magnetic tape, titled at that time Saxophone Phase, and was later published in two versions: one for any reed instrument and tape (titled Reed Phase), the other for three reed instruments of exactly the same kind (in which case the title is Three Reeds). It was Reich's first attempt at applying his "phasing" technique, which he had previously used in the tape pieces It's Gonna Rain (1965) and Come Out (1966), to live performance.