modal gate switching

Adams's structural technique in Phrygian Gates: the music exists in a fixed mode (either Lydian or Phrygian), and at certain moments an abrupt 'gate switch' changes the mode entirely — no gradual transition, just an instantaneous cut, as an electronic gate opens or closes. The piece cycles through eight modes alternating between Lydian and Phrygian in six keys over ~28 minutes. The term 'gate' is borrowed from electronic music: a voltage gate that opens or closes a signal path.

Gate switches are structural events — they should be played as written, without softening or preparation. The abruptness is the point: the music shifts identity in an instant, and the performer's job is to make the new mode sound immediately inevitable. Avoid decrescendo or rubato leading into a switch; let it be a surprise.