The app contains lyrics and melodies of various Christmas carols and songs. The Pro version features ad-free content and various functions for better controlling the playback of the song. Including: ❅ Christmas' Carols. ❅ New Year's Carols. ❅ Epiphany's Carols. ❅ Jingle Bells. ❅ Silent Night. ❅ Oh Christmas Tree. ❅ The Little Drummer Boy. ❅ Santa Claus is Coming. ❅ Rudolf.