Clarinet Quintet,Woodwind Ensemble Bass Clarinet,Bassethorn,E-Flat Clarinet - Level 3 - Digital Download SKU: A0.1209323 Composed by Wolfgang Amadeus Mozart. Arranged by Ray Thompson. Classical. 27 pages. RayThompsonMusic #807439. Published by RayThompsonMusic (A0.1209323). The Adagio in Bb K411 was originally written for 2 Bb Clarinets and 3 Basset Horns. It is a ''stand-alone'' movement and is believed to have been written for a Masonic function in late 1785. This arrangement includes all the original parts (2 clts and 3 basset horns).Alternate Bb clarinet and alto clarinet are provided for basset horns 1 and 2.Bass clarinet is provided for basset horn 3.