Klemperer, Otto. (1885–1973) Signed ContractUnusual item from the German born conductor and composer. Though best known as one of the twentieth centurys greatest interpreters of the core German repertoire, he also premiered important works by the likes of Jancek, Stravinsky, and Schnberg. DS, two pages both sides, 8. 5 x 11, no date. Acknowledgement of receipt of a notice of use of copyrighted music on mechanical instruments agreement for Klemperers work Merry Waltz. Signed on the reverse of