String Trio Cello,Viola,Violin - Level 2 - Digital Download SKU: A0.1313474 Composed by Johann Sebastian Bach. Arranged by Frej Wedlund. Baroque,Classical. 6 pages. Frej Wedlund #902233. Published by Frej Wedlund (A0.1313474). The famous and beloved air (or aria) from BWV 988: Aria mit 30 Veränderungen or the Goldberg variations, in an arrangement for string trio.Executions of all ornaments are included both in score and parts.