You cannot without paying again, afaik.
Do you have a TimeMachine backup of your system? Then try to restore the following folder in your System Library from your backup:
For example, to restore sting's Roxanne:
/Library/Application Support/GarageBand/Learn to Play/Artist Lessons/Sting_Roxanne.mwand
I just discovered, you should be able to download the artist lessons again from the App Store, see this Support Article:
LéonieMacBook Pro, OS X Mountain Lion, 2.4 GHz I.Core i7, 16GB RAM, 500GB
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