4. Ain't No Grave - WrestleMania 27 (2011)
http://youtu.be/pGNydJkNBOk The Undertaker faced off with Triple H at WrestleMania 27 in 2011. It was their second WrestleMania match although WWE really didn't talk about the first time they competed at WrestleMania ten years earlier. What was notable about the entrance is that he didn't use one of the signature Undertaker theme songs. Instead, it was "Ain't No Grave" by the legendary Johnny Cash. The song fit Undertaker well since Cash was known for wearing a black hat like Undertaker and obviously talking about a grave fit a character like The Undertaker perfectly. Great song too. One of the best Cash tracks ever. If you watch the video of the match on WWE Network or
WWE's Youtube version of it, they play the classic Undertaker song. However, that's not what really played at the event. It must be an issue where WWE didn't want to put up the money to pay for the song after using it live.