Yes, John Mayer has been a little bit of a JERK, but DO NOT dog the Avett Bros for joining his tour. Mayer is a great musician and this is an awesome opportunity for the Avetts to spread their talent and add to their growing fan base. BOO to whoever said "Puke or this is not a good thing". You are obviously not an educated fan of music. Get over yourself and LISTEN. And if not, no one will miss you...