Despite his lifelong career as a conductor, Weingartner regarded himself as equally, if not more importantly, a composer. Besides numerous operas, Weingartner wrote seven symphonies which have all been recorded, with his other orchestral music, by "cpo - classic production osnabrück", in Osnabrück, Germany. A sinfonietta, violin concerto, cello concerto, orchestral works, at least five string quartets, quintets for strings and for piano with clarinet and other pieces including a great many Lieder for voice and piano, one of which, "Liebesfeier" (text: Lenau) achieved a status as his most famous short work, in effect a "hit". Weingartner's choice of verse for his songs mirrors that of his contemporary composers: Max Reger, Joseph Marx, Richard Trunk and Richard Strauss.