Uncle Grandpa Sings the Classics is a short after the episode Uncle Grandpa for a Day.
The short begins with Uncle Grandpa Singing The Classics which is an ad brought to you by Mart Mart. The faux commercial essentially tries to sell you the Uncle Grandpa Sings the Classics CDs, but in order to order it you must cry like a turtle.
Songs that were sung in the commercial
Songs that were mentioned