Hello and welcome to Apple Support Communities PaulaHNeedsHelp,
We see that you have a question about getting your music on to your Chromebook. We'd be happy to provide you with some information to help answer your questions.
If you have music that you purchased from iTunes, you would not be able to access it on the Chromebook through iTunes, as it is not available on the Chromebook.
However, if you join Apple Music, you would have access to tons of music from different artists and genres on your Chromebook. If you've already downloaded the app from the Google Play Store, the article below will help with joining, if that is what you choose to do.
Join Apple Music on Android
Reach back out if you have additional questions.
Thank you for using Apple Support Communities.