10 Iconic Rock Stars Who Guested On Pop Songs

10. Sing for the Moment - Joe Perry

The entire art behind rap albums is to add in a guest verse by some of your peers. No one in the rap game gets to the top alone, and Eminem knew that all too well, getting someone like Dr. Dre to be his right hand man on most his early records. He had reached the top on the Eminem Show though, so why stop at samples when you can get the real thing?

Em was trying to approach this record from a more rock perspective, and Sing for the Moment is practically the thesis statement, with the sample being borrowed heavily from Aerosmith's Dream On. As the song plays out though, we get an extended guitar solo that wasn't in the original cut, which was actually played by Joe Perry after being called into Em's studio.

For as far as Aerosmith have come since the days of Dream On though, this collab actually made a lot more sense than you probably realized. Before rock and rap were even thinking about comingling together, Aerosmith were already breaking down barriers by being one of the first bands to collab with a hip hop artist on their own reworking of Walk This Way with Run-DMC. In that respect, this is just Em calling in a favor from one of the men who helped open the floodgates for rap rock to become a thing later down the line. It might sound a little strange on paper, but there's a lot more in common between rock and hip hop than most people realize.