You didn't say how old these kids are but here is a link below that has all kidsongs on there. Check it out below

Thank God for Kids by the Oak Ridge Boys.

jingle bells Christmas songs

Maybe Barney the dinosaur has an album lol.

"Because I got High"-Afroman

A couple of my friends and I are volunteering to play guitar/piano/sing at a hospital this holiday season and we were wondering if anyone knew any popular songs that can be played on guitar and sung? Were already doing christmas songs so were looking for more popular music that the kids could sing along to and that would brighten their spirits some. Any suggestions please?