Yahoo! Music is hosting a live stream of the 2017 Firefly Music Festival from Delaware this weekend. Currently OK Go is burning down the stage with their epic-sized rock music. Next up, is a youthful and energetic set of live music from Twenty One Pilots. *Updated on Saturday, June 17 at 10:18 a.m. Both OK Go and Twenty One Pilots performed above par live sets. I've seen OK Go perform a few times, and have noticed that with each year the band adds classic tracks to their growing catalog of music. Twenty One Pilots hosted an impressive set