"Rock Hard" is a single by the Beastie Boys, released by Def Jam Records on 12" in 1984.

The track contains samples from the AC/DC song "Back in Black", which was used without obtaining legal permission, causing the record to be withdrawn.

When the group planned to include the out-of-print song on their 1999 compilation, Beastie Boys Anthology: The Sounds of Science, AC/DC refused to clear the sample.

Ad-Rock then added, "So we told them that we don't endorse people playing guitars.

While this platter delivers ample boasts for the buck, the Beasties never take themselves or their genre too seriously.