Contributing to song collaboration workspaces.
For every published song collaboration workspaces that you contribute to, you will gain 10 MB of disk space.
New member referrals.
For every new member that you invite, that signs up and participates in a collaboration project, you will gain 15MB of disk space.
Sharkboy may be a horrible singer but other then that he is a nice guy. If you ask nicley he may add some space for you.