Actually, I love the Fisher Price blocks too. Even as a grown up.
When you clean them though, make sure that you just wipe them over with warm soapy water. Don't immerse them as they'll never be the same again.

I'm fairly sure that Einstein didn't have any light-up musical toys, and he still turned out brilliantly. Thjese things are a dime a dozen at op shops. Why? People get sick of them and throw them out. Our kids have enough landfill to deal with...