itunes: My itunes bought music

i just did a fresh install of leopard and i've noticed that i cant copy the music that i bought from the itunes store to my ipod, does this mean that all the money i have spent is now to go to waste? Anybody know what to do?

thanks

Jordan

if you click on the music and then enter your password that should authorise the music for your computer.

That is one of those things I forget to do, every time I upgrade my systems.