By the time fun. scored a ubiquitous hit with "We Are Young" earlier this year, guitarist Jack Antonoff was already a Bonnaroo veteran, having performed on the farm numerous times before with his former band, Steel Train. Antonoff recently told Rolling Stone that his 2005 Bonnaroo debut is still his favorite live experience ever – but he expects to top it this year when fun. close out That Tent on Sunday evening. Explains Antonoff, "I see it as creating a big, emotional, important send-off to what was probably the greatest weekend in a lot of people's lives."