Stevie Wonder - I Wish (1976)

From arguably his best album Songs In The key Of Life, it got to No.1 in the US pop and soul charts and has been sampled and covered by many. But none can match the mastery of the original, let alone beat what I like to call The 'Stevie Wonder Effect'; i.e. an artist covers a Stevie song and it sounds pretty good until you hear the original and suddenly the cover sounds like dogmeat. In my opinion, only Incognito's cover of  Don't You Worry 'bout a Thing beats The 'Effect'.