Learn to play Trombone

Available from December 2018

Learn to play the Trombone

Welcome to the one and only Trombone app you’ll ever need! By downloading it, you’ll be able to not only to practice professionally and become a better trombonist but without having to pay a thing! Do you want to surpass Bill Watrous’ abilities? Do you want to be the best there is without having to leave the cozy spot of your couch and to pay for private lessons? Download our app, and let your journey to professionalism begin!

Campaigns & Challenges

Up your level in the Trombone Campaign and prove that you have what it takes to raise from an underground trombonist to a legendary musician.

Interactive Feedback

With our unique and innovative instant feedback feature you can improve your trombone skills on the go.

Large Collection of Music

Over 200 trombone songs in our database for you to practice. All available in your pocket.

Made For Everybody


Learn the basics

Start out slow

Push your way through the campaign

Learn from your mistakes


Try different techniques

Speed up your tempo

Challenge your friends

Choose from your favourite songs


Compete versus the world

Try something new

Push yourself outside your comfort zone

Play Modes


With over 125 levels the Tonestro trombone campaign will help you learn new techniques and push your skills to your limits.


Every week there will be a new challenge. Compete versus people from all over the world. Become the best trombonist there is!


Nothing better than playing and practicing with your friends. Now you will have this opportunity. Invite your friends and compete with each other.

Available from December 2018

What Do People Say?

Do you want to see how the magic is done? We have made a blog post on how our signal processing and algorithm work while you’re rocking the trombone.

Available next week.

The easy and fun way to master the trombone.

tonestro for iOS and Android.

Available from December 2018