David Bowie's "China Girl" was co-written by another icon. The popularity of the track helped Bowie's co-writer achieve some desperately-needed prosperity.
“Tired of Being Alone" by Al Green was inspired by an inadvisable decision that Green made while it was snowing outside. The song still has a lot of power.
Everyone knows that Taylor Swift writes her own songs — including a former boyfriend who criticized her "cheap songwriting." He also refused to talk about one eyebrow-raising line from that tune.