Mortier - Petit Ballet for Clarinet Quartet - CQ1131EJM Editions Maurer Sale! from $24.00 Qty. Add to Cart SKU: CQ1131EJM Petit Ballet (en Hommage a Serge Prokoffiev) by Willy Mortier. Instrumentation: E-flat Clarinet 2 B-flat Clarinets Bass Clarinet