caption website associated_acts years_active birth_name image_size article_title background birth_date instrument genre image origin name occupation
schuster in 2011 . http://www.maratone.se max taylor swift , usher , pink , lily allen , martin adam lambert , maroon 5 , avril lavigne , blinded , colony , refused benny blanco , britney spears , 2003 -- present karl johan schuster 150 shellback -lrb- record producer -rrb-
 non_performing_personnel 1 february 1985 guitar , drums , bass , keyboards , vocals pop melodic death metal , electropop , dance-pop , pop rock , shellback bnw picture.jpg karlshamn , sweden shellback songwriter , record producer , musician
shellback -lrb- record producer -rrb-

karl johan schuster -lrb- ; born 1 february 1985 -rrb- , known professionally as shellback , is a swedish songwriter , record producer and musician .
shellback was listed as the no. 1 producer of 2012 on `` billboard '' magazine 's year end chart , and he also topped the list of their `` top 10 songwriters airplay chart '' the same year .
he regularly collaborates with songwriter max martin , and together they have produced , written and/or co-written songs for p!nk -lrb- `` so what '' , `` raise your glass '' , `` fuckin ' perfect '' -rrb- , taylor swift -lrb- `` we are never ever getting back together '' , `` i knew you were trouble '' , `` 22 '' , `` shake it off '' , `` blank space '' , `` style '' , `` bad blood '' -rrb- , adam lambert -lrb- `` whataya want from me '' , `` if i had you '' -rrb- , britney spears -lrb- `` if u seek amy '' , `` 3 '' , `` i wan na go '' -rrb- , usher -lrb- `` dj got us fallin ' in love '' , `` scream '' -rrb- , avril lavigne -lrb- `` what the hell '' , `` wish you were here '' -rrb- , ariana grande -lrb- `` problem '' -rrb- , and maroon 5 -lrb- `` one more night '' -rrb- .
shellback has collaborated with fellow producer benny blanco for `` payphone '' and `` moves like jagger '' by maroon 5 and `` she does n't mind '' by sean paul .
he has also produced songs by himself , including `` want u back '' by cher lloyd and `` animals '' and `` this summer 's gon na hurt '' by maroon 5 .
