Songs
- Porgy and Bess: It Ain't Necessarily SoSergiu Schwartz & Ruzhka Charakchieva
- Porgy and Bess: SummertimeSergiu Schwartz & Ruzhka Charakchieva
- LiebesfreudSergiu Schwartz & Ruzhka Charakchieva
- LiebesleidSergiu Schwartz & Ruzhka Charakchieva
- Violin Sonata in A Major: IV. Allegretto poco mossoSergiu Schwartz & Ruzhka Charakchieva
- Violin Sonata in F-Sharp Minor: III. Recitativo - Fantasia. Ben moderato - Molto lentoSergiu Schwartz & Ruzhka Charakchieva
- Violin Sonata in D Minor: II. AllegroSergiu Schwartz & Ruzhka Charakchieva
- Violin Sonata in A Major: I. Allegretto ben moderatoSergiu Schwartz & Ruzhka Charakchieva
- Vocalise, Op.34Sergiu Schwartz & Ruzhka Charakchieva
- Cantabile In D Major, Op.17Sergiu Schwartz & Ruzhka Charakchieva
- String Quartet No. 1, Op. 11: Andante cantabileSergiu Schwartz & Ruzhka Charakchieva
- Chant sans Paroles, Op. 3, No. 2Sergiu Schwartz & Ruzhka Charakchieva
- Violin Sonata No. 3 In D Minor, Op. 108: IV. Presto AgitatoSergiu Schwartz & Ruzhka Charakchieva
- Violin Sonata No. 3 In D Minor, Op. 108: III. Un poco presto e con sentimentoSergiu Schwartz & Ruzhka Charakchieva
- Violin Sonata No. 3 In D Minor, Op. 108: II. AdagioSergiu Schwartz & Ruzhka Charakchieva
- Violin Sonata No. 3 In D Minor, Op. 108: I. AllegroSergiu Schwartz & Ruzhka Charakchieva