Igor Stravinsky ,a great Russian, was excperimenting ,but within tonal system in enlarged use of orchestra writeing especially ballets.His most important work is Firebird especially Finale.

Most important tunes:

Firebird especially ( Ballet ) Filale,
Petruschka ( Ballet ) Nr 7 Danse Russe,
Le Sacre du printemps ( Ballet ) ,
Pulcinella ( Ballet ),
Psalms Symphony,
Rossignol

O.F.D This list is still incomplete