Reich's Clapping Music is one of the most famous pieces using phasing as a musical device. An animated illustrating of the process. His Music for Pieces of Wood shares similar approach but achieves in in a slightly different way:
 Piano phase, as the name indicates, applies phasing techniques but with pitched material. The first part of Tehilim (psalms) uses phasing to generate rich evolving textures. And discussion of the composition process:

This is how Reich describes his interest in 'process music'.  And an interview were he discusses his approach to composition (including planning a piece, harmonic material, and inspiration):

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