 Although vocals would usually take many alternate takes to complete , Hoppus completed much of the vocal track for " Adam 's Song " in a single take . " It 's in a pretty high register for me , so I just blasted it out one night after dinner . That 's , like , 90 per cent of what 's on the final track , " he told Kerrang ! . The idea to include piano in the track came without much forethought ; " We realized , ' Well , this part here could sound rad if we put piano in here . ' So we tried it out , and it sounded rad , " said Hoppus . The piano was performed by session musician Roger Joseph Manning , Jr . , best @-@ known for his work with Beck . 
