"It's been amazing year, and 2013 is kicking off with us doing the inauguration ... it's just an incredible thing," said lead singer Nate Ruess. "I think the three of us care so much about Obama and so to be invited, I can't even deal."
Beyonce, Katy Perry star at packed inauguration →
Ruess: I write the set list every night before we go onstage.
Q&A: fun. lead singer on Grammy nods, tour, life →