Their producer, Rick Rubin, along with Jam Master Jay, urged them to release a joint effort with…oh…this band called Aerosmith (heard of them?)… Together, RUN D.M.C. and Aerosmith released the most famous “cover” of any song in history: “Walk This Way” (I’ll give you a minute to sing it in your head!)…ok…back again: In 2008, “Walk This Way” was ranked #4 on VH1’s “100 Greatest Songs of Hip Hop”. This version of the song is currently ranked as the 88th greatest song of all time, as well as the best song of 1986, by Acclaimed Music! (source:wiki) 
