Columbia subject headings:
Harvard subject headings:
Concertos (Trombone)--Solo with piano.
Concertos (Viola)--Solo with piano.
Princeton subject headings:
Arrangements (Music)
Concertos (Trombone with orchestra)--Solos with piano.
Concertos (Viola with orchestra)--Solos with piano.
Concertos.
Parts (Music)
Scores.