Rhythm Runner Plus

Rhythm Runner Plus links your Android phone to your Spotify account and lets your feet choose the music.
When the app detects the pace of your walk or run, it will then start playing a music track with that same beat.

It will scour the database of Spotify and select music to your chosen genre.

Just start the app, hold it in your hand (or use a fitness band that connects to Google Fit) log into your Spotify Premium account and press play.