I have often wondered  how  important the  seemingly symbiotic relationship between Glen Campbell as artist, and Jimmy Webb  as songwriter  was to  each of their careers. ?

Both unquestionably great in their respective fields, with significant success  without the other, but  the combination of their talents seemed to propel those particular songs to dizzying heights.

Similarly I have wondered  how might you measure and value the input of Sir George Martin  into The Beatles  massive success ?

  Whether one personally  loves/hates/is indifferent to The Beatles or their product,  is of no consequence  to this  mind exercise.