This is a fun piece for two Violas playing the same part but with one player starting one bar after the other player. There are two separate printed parts plus a score with both parts. It is by Domenico Gabrielli an Italian composer and Cello virtuoso who was born in Bologna in1651. He became widely known as a Cello virtuoso and composer of Vocal music. He wrote 12 operas in the 1680s but he contracted an incurable disease and died in Bologna in July 1690.