In fact, Kauder composed over 200 instrumental works, including ten concertos and concert pieces (two each for oboe, piano and violin, one each for cello, horn, and viola, and a double concerto for violin and viola) and five symphonies. He also composed chamber music for many different combinations, including 19 string quartets, 11 piano trios, 2 piano quartets, and variations for piano quintet.
Kauder also wrote over 100 works for voice: many songs as well as vocal-instrumental settings of poems by Dowson, Yeats, Joyce, Swinburne, Goethe, Hebbel, Nietzsche, and Rudolf Pannwitz, and the opera "Merlin" on a German text by Pannwitz.
About one quarter of Kauder's scores are available commercially. In addition, a complete edition of Kauder's works on microfiche is held by the Irving S. Gilmore Music Library at Yale University. Many of Kauder's works can also be found in the archive The Hugo Kauder Papers at the University of Chicago Library. All of Kauder's original writings and manuscripts have also recently been accepted by the New York Public Library's Music Division.
If you need help finding a Kauder score, you are welcome to contact the Hugo Kauder Society.