Cl. Pft. - Intermediate-Advanced - Digital Download SKU: F2.FM292 Composed by Otto Martin Christensen. Sonata for Bb Clarinet and Piano. Score and Parts. 30 pages. Forton Music - Digital #FM292. Published by Forton Music - Digital (F2.FM292). ISBN 9790570481910.Following the traditional three movement form, this new sonata for clarinet and piano is an exciting addition to the repertoire. Rich jazz harmonies, sophisticated syncopations and lyrical melodic lines make this a great piece for the concert platform for advanced players.