 " Gotta Be You " is a mid @-@ tempo pop rock ballad . According to the digital sheet music published at Musicnotes.com by Sony / ATV Music Publishing , One Direction 's vocal range in the song span from the note of Eb4 to <unk> . Written in the key of Ab major , the song is set in common time at a moderate tempo of 85 beats per minute . 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 . The lyrical content is characterised by love notions and prominently revolves around its main declaration , " It 's gotta be you , only you " . 
