Metallica and Black Sabbath have teamed up to give April's (10) Record Store Day a big boost.
The heavy rock supergroups will feature on a limited edition double-A-side, which will be released to coincide with the event on 17 April (10).
According to, the 12-inch single will feature the Unkle remix of Metallica's Frantic and a new version of Black Sabbath anthem Paranoid.
Only 1,000 copies of the special single will be released.