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John Stevens "Reverie". The whole point of the CD is a relaxing, pleasant listen. There is no "Look at what I can do" type of music. Here is Amazon link. but track listing is incomplete.
http://tinyurl.com/9dobof

Here is the complete set of tracks for MP3 download (at $0.99 each) or sampling.
http://tinyurl.com/7aozy4

"Metamorphosis" by the Monarch Tuba-Euph Quartet is a fantastic album. Great mix of styles and genres, and the medley at the end is spectacular. Don't know if it's considered a "must-have," but I enjoy the heck out of it.

Check the For Sale forums. Dave Zerkel is selling his recordings for $10. Tuba Helper is exactly what you're looking for.