Patrick Neher wrote Two Arias for String Orchestra in memory of Vincent Lionti, who died of Covid19. Vincent was a wonderful violist and conductor, so as a tribute, this composition has many viola solos accompanied by bass solos.
The piece is orchestrated for full string orchestra, with very few divisi in violins primarily. There are violin, viola, cello and bass solos (played by first desk principal) that are integral to the composition. But the piece could be played by string quintet.
Two Arias (Elegy and Homage) is about 14 minutes long. You can purchase the score and parts on the symphonic page at ISG Publications.