Your 7 year old might want to check out the Planet Rock website they're in the middle of Rush month and there's a minisite there dedicated to the band.  You can listen online to the station too but not sure if it works outside the UK.  (Rush are a band that completely passed me by until January this year after I started listening to PR - I now have 3 of their albums and next time I go to a record store I'm going to look for "A Farewell to Kings").