Im a huge Smallville fan and as I was watching a few episodes I noticed that there was a couple of Elvis songs in the series. I thought there were more but I was wrong but you can find the following songs on Smallville:
Season 2- A Little Less Conversation, Episode - "Heat"
Season 3- (It's not a song by Elvis but it's about him) Walking In Memphis, Episode - "Perry"
Season 4- It's Now Or Never, Episode - "Unsafe"
I swear I heard Burning Love on an episode and i'm gonna keep researching it. Anyways this was a pointless blog pretty much but im a huge Superman and Elvis fan, I thought it was cool they were together in a couple episodes.