Once is the fifth album by Nightwish, released June 7, 2004 by Nuclear Blast Records. Spinefarm Records also released a platinum edition of this album on November 24, 2004, containing the original tracks in addition to Live to Tell the Tale, White Night Fantasy and the video for Nemo by Antti Jokinen. The North American version of Once contains the video for Wish I Had an Angel instead.
Once is the debut album by American alternative rock band The Tyde, released in 2001.
"Once" is the lead track on Pearl Jam's debut album Ten. On Ten, it is preceded by a brief interlude of the album's closing hidden track, "Master/Slave." Besides Ten, the song was also featured as a B-Side on the single for "Alive."