This duet for viola and cello was composed by Ludwig van Beethoven about 1795-98.
Beethoven himself called this sonata movement for viola and violincello “Duett mitzweiobligaten Ausenglasern” (Duet requiring two pairs of spectacles).
This edition is the first publication after the original in the British Museum. There is a striking melodic resemblance between this duet and the first movement of Beethoven’s string quartet in C minor, op. 18 No.4.
Here is this delightful music: