10GB is hard.  And even if they quote it, check the ToS - they'll typically have something saying that the service is explicitly not for file storage - only for storing content critical for the website (ie HTML pages and images), which basically means you'll never use the space anyway.
Even paid hosts do this, so be careful.  They enforce it by checking your space usage (ie, if you're using above 2GB, chances are that you're not storing just HTML pages and images - they'll search for large files and send you a notice to remove them).

But is the 10GB used to store MP3s?  (that's a lot of MP3s, especially for just one band...)  Would you be able to consider using a more efficient audio compression format?