Concert Vault
Top 30: Special Guest Appearances
Published: Sep 15, 2012 10:59 AM
Top 30: Special Guest Appearances
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Top 30: Special Guest Appearances

Published: Sep 15, 2012 10:59 AM
It's not always pretty, but it's always a thrill when an unannounced guest shows up to jam on stage. Here are our 30 favorite such instances in the Vault.