I like a cappella groups, such as Pentatonix. Here's a new one, Linkin' Bridge, from America's Got Talent this year. When you see them, you're surprised about the song they chose for their performance: Somewhere Over the Rainbow. They are great, and I like their version of the song.
I've seen this song in the documentary about Johnny Cash. Even though I know some of his songs, I didn't know this one. I really like the lyrics.
Sound and picture of this video don't match exactly. I couldn't find a better version.