A
set (
pitch set,
pitch-class set,
set class,
set form,
set genus,
pitch collection) in
music theory, as in
mathematics and general parlance, is a collection of objects. In
musical contexts the term is traditionally applied most often to collections of pitches or
pitch-classes, but theorists have extended its use to other types of musical entities, so that one may speak of sets of
durations or
timbres, for example.