Euphonium Lessons - tonestro is an iPhone application developed by fun.music IT GmbH. It falls under the category of Education & Reference and is available for free.

The app is designed to help users learn to play the euphonium and improve their rhythm and pitch. tonestro listens to users while they play the euphonium or baritone horn and provides immediate live-feedback on rhythm and pitch. It also features a tuner that allows users to easily tune their euphonium.

tonestro offers a wide range of songs, exercises, and guided lessons for every skill level. Users can learn how to read music notes and enhance their euphonium skills by playing various songs and exercises. The app also includes fingering charts to help users learn the correct fingerings for each note.

In addition to the learning features, tonestro provides a metronome and specially composed background music with play alongs for many songs, enabling users to practice with perfect rhythm. The app also offers weekly challenges with hand-picked songs, allowing users to compare their skills with euphonium players from around the world and stay motivated.

Please note that tonestro requires a subscription to access the entire learning content and song library, with each subscription plan potentially including a 3-day free trial period.