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.