get yourself a girls aloud album, anything by Sclub 7, things like the maccarena (if thats how you spell it) and the ketchup song...
to be honest my seven yr old god daughter is into all of the top 40 tracts.. so go down to hmv or somewhere and get yourself the latest "now" album (last i remember was now42 but it'll probably be well into the sixties by now hahaha!) also.. pop into your local music store or woolworths and ask them.. they'll point something out to you and in a big store like that there's something for everyone!!
good luck!!