classroom playlist!

I'm putting together a classroom playlist for preschool and I might need a little help?  I have plenty of childrens songs CD's, story CD's and even classical.  Now I'm on the hunt for some popular music tunes :]  I love when my 'littles' start singing songs they've heard on the radio or from their parents playlists!  Of coarse, no 'swears' or 'negative lyrics' allowed...can you help?  Here are a few I have so far...what do you think?  Suggestions welcome :]

"The Show" by Lenka

"Free and Easy" by Dierks Bentley

"Somewhere Over the Rainbow" by Israel Kamakawiwo'ole

"Say Hey" by Michael Franti

"Firework" by Katy Perry









There are the one's I have chosen....I think they are fun :]  Now...send me some YOUR kids love!
Miss Lisa