Volts is an album by AC/DC released as a part named "Disc Four" on the Bonfire box set. Released in November 1997, the album is a compilation of some alternate versions of songs recorded for Let There Be Rock and Highway to Hell albums, and some songs previously released.
"Dirty Eyes" is an early recording, which later turned out as the song "Whole Lotta Rosie" which is found on both versions of Let There Be Rock.
"Touch Too Much" is the same track found on Highway to Hell, but with different riffs and lyrics.
"If You Want Blood You've Got It" is the same track found on Highway to Hell, but with different lyrics.
"Back Seat Confidential" is an early recording, which turned into the song "Beating Around the Bush", which is found on Highway to Hell.
"Get It Hot" is the same track found on Highway to Hell, but with different riffs and lyrics.
"Sin City" was recorded live from Midnight Special.
"Walk All Over You" & "T.N.T." were recorded live from Let There Be Rock: The Movie in the Australian Version.
"She's Got Balls" was recorded live from the Bondi Lifesaver, and is also found as a b-side to the single "You Shook Me All Night Long".
"School Days" is from T.N.T., and was previously unreleased outside of Australia.
"It's A Long Way To The Top (If You Wanna Rock 'n' Roll)" was previously released on T.N.T. and the international version of High Voltage.
"Ride On" was previously released on the Australian and international releases of Dirty Deeds Done Dirt Cheap, and there are several hidden interview tracks after this song.