Finally, the 2013 XPoNential Festival is here! Arguably the best weekend of live music Philly has to offer, you need to be prepared. Rather than the typical blog post where one source tells you who to like for an upcoming fest, we at Root Down in the Shadow are going to take a different approach to giving you a listening guide to the artists at the upcoming fest. I've asked my contributors and some of the festival artists for their views on who to see. Here's the results: Aaron Brown of Aaron & the Spell (Wiggins Park- Friday 5:30) Another band i'd like to see on the day I play : I'm actually pretty excited to see Michael Kiwanuka . It's not because, he plays right after [Aaron & The Spell]. I saw him when he played at the Trocadero in the winter and I enjoyed the show. I've been listening to Home Again , and really dig the title track Another band i'd like to see on Saturday or Sunday : Wilco ! They play on Sunday and are on