HI,
First check that the E72 can play apple lossless files, i dont think it can. If not, you will need to convert them to something it can play.
To get the music on there you can either
1. Use Microsoft Media Player and sync via bluetooth (if you have BT it on your pc)
2. Use something like Media Monkey and sync via bluetooth (if you have BT it on your pc)
3. Copy & paste the music onto the inbuilt micro sd card via bluetooth, or via the supplied USB cable with your phone.
4. Use Nokia PC Suite or Ovi Suite to sync the music to your nokia.
I have the E71, and if it were me, and I had no need to constantly change the music, I would just use copy and paste.