Invest in some great music cd's that your kids will love. We have a few but were listening to the same things over & over again. So, we stopped by Target to check out their selection the other day & found some great Disney cd's. The one we ended up getting was music from the cartoon Phineas & Ferb - even my husband is excited to listen to this in the car since this is a cartoon he & Chase enjoy watching together. The kids & I had fun jamming out to this cd during breakfast today & I know we'll have fun listening to it while we're out driving around.
Some other music we really like: Primary Colors by Inside Out and I Have a Song for You by Brite Music
I think we'll pick up a couple more Disney cd's maybe the Imagination Movers or even some Disney classics in the next couple of months. I love the spirit that good music brings into our home!