György Ligeti: Musica ricercata (1951-53), excerpts
Global structural feature of Musica ricercata is confines to only certain pitch classes in each movement, with each subsequent movement having exactly one more pitch class than the last.
I:
A, D
-
II:
E♯, F♯, G
-
IV:
A, B♭, F♯, G, G♯
-
VII:
A♭, A, B♭, C, D, E♭, F, G