This is Schubert’s only string quartet, completed two months before he died at the age of 31 in 1828. It is unusual because it is scored for two cellos instead of the usual one, and one viola instead of the usual two. Schubert knew he was dying and I feel you can hear his sorrow in the work.
This is a performance by the Borodin Quartet with cellist Alexander Buzlov:
Here is the score: