The etudes in this book have been chosen because they are musically interesting and technically challenging. I have made an effort to be certain that all of these etudes can be performed well on the tuba. Care has been taken to arrange for breathing and phrasing to make these etudes musically enjoyable to perform. The composers of these etudes remain unknown. In my research I discovered that each etude has at least two people that claim to have composed it. I have, therefore, decided not to give credit to any one composer for creating these studies. I have presented each etude at least three times in this book. Each version is in a different key. One of the versions is also in a different meter. This was done because of the great technical benefits to be derived from learning the same etude in different keys. By using the meter changes one can learn to perform music that looks somewhat different than it sounds. Practice and learn one etude at a time. Make certain that you have mastered each etude in all different keys before going on to another. Try to make each version of the etude sound the same as the other versions.