These exercises are from Arnold Jacobs' Special Studies for the Tuba (and Euphonium) and includes:

Beautiful Sounds

includes major and minor variaitons

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Scale Studies exercise

available in 3 tempi [80, 100, and 120 BPM] and take the player through all 12 major keys and utilize a variety of articulation patterns (that were added by the creator of these backing tracks, Dr. Brett Copeland).

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Development of Low Register and Resonance

available in few different keys, starting with the original key for the exercise of Eb, and is expanded up to F# and down to C.