Q: do you know any songs (pop or anything) that use only two chords all the way through?
A: mambo #5, row row row your boat, jay z '99 problems', collie buddz 'legal now', post malone 'psycho', return of the mack, spinners 'i'll be around', aaliyah 'rock the boat', chick corea 'the dragon', lenny kravitz 'i belong to you', jojo 'baby it's you', curtis mayfield 'diamond in the back', aaliyah 'try again', ryan duarte 'you', jay z 'imaginary player', chris brown 'yeah', robin thicke 'blurred lines', alicia keys 'fallin', rihanna 'if it's lovin that you want', the macarena, snoop dog 'gin and juice', the congos 'la la bam-bam',  and many many many many more