Mr.Music is rerulili's second album. It contains 7 tracks, sung by multiple vocaloids, though mainly by Hatsune Miku, and utaite. It was first released at THE VOC@LOiD M@STER 16, and later at Comic Market 80. Featured on the album is rerulili's hit song, Mr.Music with over 700,000 views, and also an utaite cover of the song which has reached over 1 million views.
A crossfade of the album can be heard on Nico Nico Douga.