Mikhail Glinka
Mikhail Glinka (1804-1857) is regarded as the first great Russian classical composer, whose music influenced many generations of later composers.
His most famous work today is the overture to his opera Ruslan and Lyudmila, one of two operas he wrote.
This website features piano accompaniment tracks for Glinkas Viola Sonata, which despite having been left unfinished (without a third movement) has become a staple of the viola repertoire. A link can be found below.