Greg Kurstin is a co-writer of Hello.
 Songwriting partnership can be between a composer and a lyricist (Andrew Lloyd Webber with Tim Rice or Elton John with Bernie Taupin), a performer and a producer (Madonna with Patrick Leonard or Mariah Carey with Walter Afanasieff), or between bandmates (John Lennon with Paul McCartney of the Beatles or Bjrn Ulvaeus with Benny Andersson of ABBA)
 Kurstin joined his first band at the age of 11, and at 12 co-wrote "Crunchy Water", the B-side to classmate Dweezil Zappa's "My Mother Is a Space Cadet"

