Weird Al Yankovich in future episodes? · 8:14pm Aug 13th, 2012
apparently, it is probable. turns out that William Anderson, the guy behind the music, is friends with Weird Al and Weird Al is also a Brony. they also mention that Weird Al might appear in future episodes of MLP:FIM.
http://www.equestriadaily.com/2012/08/weird-al-mlpfim-shoutout-and-possible.html#more
YES!
Weird Al? We get all the best people.
-SoI