Top of my list at the moment is the Shostakovich Viola sonata
Some of the others that I feel I must learn to performance standard are the:
Martinu Rhapsody Concerto
Vieuxtemps Capriccio
Britten Lachrymae
Bloch Suite
Bergsma Fantastic Variations on a Theme from Tristan
Bach Cello suites (complete, not just the selected movement that I already play)
Bach Violin Sonatas and Partitas.
I am also desperate to learn the Quincy Porter Viola Concerto as viola players who have played/heard it say it is one of the best viola concertos, but there is no recording of it available and the sheet music is out of print
Does anyone else have pieces that they are determined to learn eventually? If so, what are they?