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I am seeking recommendations for avant garde style euphonium solos (with or without piano accompaniment) for my college students. I am especially interested in pieces of moderate length and difficulty. Thanks.

There isn't a ton of music out there that fits the bill, but I can think of one great work. Here it is: http://www.youtube.com/watch?v=I5lg0eJu9KY. It's a called Si! by Karlheinz Essl, and it is written for tenor tuba (euphonium) and computer (running a software program called Max/MSP).