No specific order, this list good for today only:
Stella by Starlight, Young & Washington (OK, more of an instrumental they added words to but you get the idea)
Any number of Stevie Wonder songs but today, how about "Creepin'"
The Rain Song, Led Zeppelin
Blackbird, The Beatles (almost the most perfect display of songwriting, even the bird sounds come off sounding "not naff")
Lively Up Yourself, Bob Marley (well not much of a song but it's my favorite Marley tune)
Anywhere You Go, Shawn Colvin