Free Rhythm refers to any rhythmic activity that lacks metrical organization. Music with Free Rhythm is variously referred to as unmetered, unmeasured, ametrical or amensural music, and it corresponds to what London refers to as “metrically vague contexts”.
Free Rhythm is rarely found in Western music. It is used in some 20th and 21st century Western art music, and in can be found in indigenous religious, folk, and art music around the world.
Musics that employ Free Rhythm range from those that completely lack pulse to those which have pulse but no higher level periodicity and no alternation of strong and weak beats.