I just found out about this band named The Ukuleles. I bought the album last month, after that I was searching about them. Almost all their songs are cover songs, which I think they played it very nice. They're not only playing ukuleles, but also sings. My most favorite songs which they had covered are Call Me Maybe, Rolling In A Deep, Forget You and Somebody That I Used To Know. While Krishna really like Somewhere Over The Rainbow :)
Here's one of their teaser video called "Forget You"