Sinfonia concertante in E-flat major for Oboe, Clarinet, Horn, Bassoon and Orchestra, K. Anh. 9 / Anh. C 14.01 (spurious or doubtful)

Attribution to Mozart doubtful. Köchel K6 is having different number for the original lost work and for this currently performed version. The Mozart Project considers this work doubtful and doesn't list it under concertos.

There's many scholars disputing about the authencity of this work.