Learn to play euphonium and improve on rhythm and pitch. tonestro listens to you while you play the euphonium or baritone horn and gives you immediate live-feedback on rhythm and pitch. A tuner lets you tune your euphonium easily. tonestro for Euphonium offers a large collection of songs, exercises and guided lessons for every skill level. Learn how to read music notes and improve your euphonium skills by playing many songs and exercises. With the tuner you tune your euphonium fast and easily