he's the man behind the inescapable sarah bareilles song "brave."onster hits from the band "fun" and co-wrote -- ♪ and the grammy award winning song ♪ we are young ♪ on top of that he's also wring songs like out of the woods for the musical juggernaut hit machine taylor swift. now jack antonoff is stepping out on his own with a new band called bleachers and an insanely catchy song directed by his girlfriend lena dunham of the hbo show. his improbable rampage through the american top 40 began here. >> i made the entire bleachers album in this room. >> in his childhood bedroom in suburban new jersey where he lived until a year and a half ago. >> you lived here until you were 28? >> yeah. which made you think i had to be the only person. >> why were you living with your parents? >> i felt until very recently i felt totally uncompelled to move out. >> were you really into your mom's cooking? >> no. wasn't even. that i don't really appreciate her cooking. >> reporter: you can chart his entire chronology through clutter. >> does that seem like a murderer