WDR Big Band Play Along is a free Android app developed by Westdeutscher Rundfunk under the multimedia category and subcategory of music and radio. The app allows users to play along with the world-class musicians of the WDR Big Band. It features compositions and arrangements exclusively created for the app by top big band arrangers, recorded by the WDR Big Band. The Play Along app offers 11 instruments as a solo track, including guitar, piano, bass, and drums. Each instrument has corresponding notes that users can read, send, or print on their screen. Moreover, the app includes a tutorial to help users navigate the app and a pitch pipe to ensure that users are in tune.

The app has an in-built mixer that allows users to adjust the volume of each instrument, mute individual tracks, or listen to solo tracks. It also features a speed control function that regulates the playback speed and a loop function that plays a selected passage repeatedly. Additionally, the app provides a count-off track and a metronome track to make practicing and playing along easier. The WDR Big Band Play Along app caters to users with varying levels of experience, from amateurs with a year of experience to professionals. The app features different compositions and arrangements with different styles and levels of difficulty.