2D Trombone Notes Slide Positions - How To Play is an educational application available on Android that aims to teach trombone playing. This app allows you to learn the position of the fingers on the instrument and hear the sound of each note. It features a diagram of the finger positions and a demonstration by a live trombonist. Additionally, the app has a section with Tenor Trombone lessons.

The user interface of the app is easy to navigate, making it accessible for beginners. The app is free to download and use, which is an added advantage. Overall, 2D Trombone Notes Slide Positions - How To Play is a useful app for anyone looking to learn how to play the trombone or improve their skills.