Go to any song, Tap/Click the playback style from the Player control menu, then choose from the included 50 different accompaniment styles in Jazz, Latin, Pop categories (Swing, Ballad, Gypsy Jazz, Bluegrass, Country, Rock, Funk, Reggae, Bossa Nova, Latin ...) or the 12 Blues styles/17 Salsa styles available as an In-App purchase within the app.
Mac version
The Player controls are on the right (View maximised) or at the bottom (View minimised)