# Pliéback > An iPhone music player for ballet teachers. Slow down or speed up songs from your own library without changing the pitch, and save each one at the right tempo for class. - Platform: iPhone, iOS 17 or later. - Changes tempo without changing pitch, for songs already in the music library on the iPhone. - Saves each song in favourites at the chosen tempo. - Pricing: 14-day free trial with no card, then €4.99 a year or €14.99 once. - Made for ballet teachers who need a recording slower or faster for a barre exercise. ## Main - [Any music, at the tempo your class needs.](https://plieback.com/): Pliéback is an iPhone app that plays songs from your own library, changes the tempo without changing the pitch, and saves each song at that tempo for class. - [What tempo is this piece?](https://plieback.com/tempo): Tap along to a recording to see its BPM, with the meter for each barre exercise. ## About - [Support](https://plieback.com/support): Help with Pliéback and how to get in touch. - [Privacy](https://plieback.com/privacy): No account, no tracking; your music stays on your iPhone.