- GAMES (1964). Published by MUZIKA, Sofia, Bulgaira, 1977 as a part of the collection "Pieces from Bulgarian Composers"

- THE ART OF THE SERIES (1970) "Die kunst der Reihe - klavier, 1, 2, 3 Band". Published by MUZIKA, Sofia, Bulgaira

- SONATA FOR PIANO No1 (1986) Published by MUZIKA, Sofia, Bulgaira, 1988 as a part of the collection "Piano Pieces of Bulgarian Composers" as well as in the author's collection "Three Piano Sonatas and Six Studies to Them"

- SONATA FOR PIANO No2 and SONATA FOR PIANO No3 (1987) Published by the author as a part of the collection "Three Piano Sonatas and Six Studies to Them"

- SONATA FOR PIANO No4 (1996) Finished in 2003 by Spassov's student, pianist and composer Ljudmil Raichev. Manuscript.

- 24 ETUDES FOR PIANO (1990-1992) Author's edition.

- CREATION, DEATH AND RESIGNATION (1992) for organ. Transcribed for piano by Ljudmil Raichev. Published by "Prof. Ivan Spassov" Foundation, Plovdiv, 1999

- SIX PORTRAITS OF A FACE (1994) for organ and piano. Manuscript

- 24 BAGATELLES for piano. Author's edition

- SHORT PIECE IN A FOLKLORE STYLE (1995) Manuscript.

- CONCERTO FOR PIANO AND ORCHESTRA (1976) Published by "Prof. Ivan Spassov" Foundation, Plovdiv, 1999