Consider Omar Little from The Wire. While he's essentially a homicidal gangster on the mean streets of Baltimore, he's also partial to whistling nursery rhymes. True, he may only do this just before he opens fire, but we always hoped he might have better taste in music.
Thankfully when speaking to New York magazine, actor Michael K. Williams who plays the chap, revealed that Omar does in fact have his own playlist.
Williams listened to the tracks when he wanted to get into character and thanks to Vulture.com, we have the playlist, which you can listen to below.
Creepy nursery rhymes not included.