This is interesting. I always loved iTunes 4. I feel it was the last pure version of iTunes that wasn’t bloated and actually ran well on everything.
What OS are you running with iTunes 4.0? Officially, it was only supported on Jaguar
(according to Wikipedia). Obviously you’re on a themed Tiger or Leopard. How did you coax it to install? And assuming this is Tiger, would it be possible to run it on Leopard, too?