 Up All Night is predominately a pop music album which orientates into elements of the dance @-@ pop , teen pop , pop rock and power pop genres , with electropop and rock music influences . Instrumentation throughout the record is provided by guitar strings , drums and a piano . The album opens with lead single " What Makes You Beautiful " , an uptempo teen pop and power pop song . The opening guitar riff has been noted as similar to that of Grease single " Summer Nights " . " What Makes You Beautiful " has a guitar @-@ based chorus ; Digital Spy 's Robert Copsey likened it to a cross between Pink 's " Raise Your Glass " and McFly 's " All About You " . It also contains cowbell instrumentation , and the middle eight consists of an " oh na na na " hook . The second song on the album , as well as the second single , " Gotta Be You " , is a mid @-@ tempo pop rock ballad . Set in an orchestral arrangement , its instrumentation includes a guitar , piano lines , and abundant strings . The chorus of the song opens with falsettos that are followed by vocal harmonies . 
