This past Monday night on RAW, CM Punk appeared on television and came out to "Cult Of Personality" by Living Colour. A song that Punk has used in the past for a time while he was in Ring Of Honor.
According to Apple, that song is now in the top 100 of songs currently being downloaded. It should be noted that while there is no way to absoloutley prove that CM Punk using the song on RAW is the reason for its increase downloads, the rest of the songs on the top 100 are all current song produced recently and "Cult Of Personality" came out in 1988.
So while it can't be proven unless you were to track every person who downloaded and ask them, it seems very likely that CM Punk has been the motivation of the recent downloads.