We can't confirm if "grandma drummer" is, in fact, a real grandma, but she is a pretty great drummer:

The woman stopped by Coalition Drums, a shop in La Crosse, Wisconsin, and put on a clinic for the staff using a Gretsch Catalina kit.

Staff posted the video to YouTube, stating: "We have no idea where this lady came from, what her name is, or where she went but she rocked our faces off!"
 

posted by CBC Music on Jul 19, 2013