Aaron Gallagher teaches you how to play the song Fireflies. He starts off by telling the audience that if you have a standard tuning for your guitar you need to play your chords at a different place that he does. He has his capo on the 4th fret, but everyone else should have theirs on the 3rd fret. He found a chord online and felt that he could teach people how to play from that. He explains that the whole first verse is basically a G to E. He shows how to strum the guitar to create the right rhythm. As he sings and plays the song he tell you each time you change chords.