10 great pop duets for easy piano! Play with a friend or with the online audio! Songs: All of Me (John Legend) • Grenade (Bruno Mars) • Happy (Pharrell Williams) • Hello (Adele) • Just Give Me a Reason (P!nk featuring Nate Ruess) • Roar (Katy Perry) • Shake It Off (Taylor Swift) • Stay (Rihanna) • Stay with Me (Sam Smith) • Thinking Out Loud (Ed Sheeran). The audio tracks are accessed online using the unique code in each book and can be downloaded or streamed. The files include PLAYBACK+ tools that allow you to change the tempo without altering the pitch.