Vaughan Williams composed one of if not the only Tuba Concerto. Find it on LP on RCA LSC 3281. I tell you, it is pretty hot concerto to experience in concert.
Another obsure instrument as a featured instrument is the tympani. William Kraft composed a Tympani Concerto. I don't know if any recordings are available.
There are two cds published by Hungaroton, a Hungarian label, by József Bazsinka with tuba. Both are modern XX. century music, If you need help to get them, I could help you. http://www.hungaroton.hu/. BAZSINKA JÓZSEF (tuba) HULLÁMOK, French Connection,
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