| Evolved out of a jam session in the studio. John Bonham started the beat, John Paul Jones came in on bass, Jimmy Page played a James Brown riff, and Robert Plant started singing. |
| The Crunge is a dance you can't dance to. They wanted to put dance steps for it with the album but couldn't do it logistically. |
| You can hear a studio engineer at the beginning ask Bonham if he's "ready to rock." |
| At the end Plant asks "Where's the bridge?" He's referring to the James Brown song they took the guitar riff from where Brown asks his band to "Take it to the bridge." |
| The drums at the beginning were sampled by New York DJs Double D and Steinski for a song called "Level 3." In 1989, De La Soul recorded a song called "The Magic Number," which sampled the part of "Level 3" that sampled this. What we are trying to say is this was indirectly sampled by De La Soul. |
| Page would slip the guitar riff from this into other songs during concerts. |
| Released as the B-side of "D'yer Mak'er." |