Serenade in D,K 320 'Posthorn' Serenade in D,K320 'Posthorn' 6-12. Serenade in D, KV320 Posthorn Serenade No.9 In D,K.320 'Posthorn' Serenade No.9 in D Major,K.320 "Posthorn" Serenade in D,K 203,189b Serenade in D,K 204,213a Serenade in D major, K. 320 "posthorn-serenade" Serenade in B & E flat Serenade in D,K 100,62a