Columbia subject headings:
Canons, fugues, etc. (Organ, 4 hands)--Scores.
Canons, fugues, etc. (Piano, 4 hands)--Scores.
Organ music (4 hands)--Scores.
Piano music (4 hands)--Scores.
Harvard subject headings:
Canons, fugues, etc. (Organ, 4 hands)
Canons, fugues, etc. (Piano, 4 hands)
Princeton subject headings: