This iPhone and iPad app offers two things at the same time. On the one hand, it compiles a comprehensive collection of chord sheets, with the most important pop songs starting from the 1970s and ranging to the current charts. Songs can be played back and transposed into the key of the singer. On the other hand, the app Chord Sheets features an editor, which enables users to edit the existing sheets and create new compositions from scratch. In order to make the app simple and easy to use, only the elements and buttons applicable to the current context are shown.