Music by Vladimir Sidorov. Sonata for viola and piano in 4 movements (opus 99, 2004). 4. ESPRESSIVO CANTABILE.Performed Lubov Vitavskaya (viola) and Victoria Arkhangelskaya (piano). Jubilee author\'s concert by composer Vladimir Sidorov. Concert Hall of Magnitogorsk conservatoire; October, 1, 2006.