"You Didn't Have to Be So Nice":
"Wouldn't It Be Nice?":
Very 1960s, of course. If there are "nice" songs from earlier or later eras, you'll have to flag them for me. I do know this one, but it's hardly the same thing. Meanwhile, let's vote on my "nice" songs. Just the songs. Don't count the video, which for both is nicely low quality. And don't give the Lovin' Spoonful extra credit for Peter Noone.
UPDATE: The Peter Noone version was taken down so I've changed the embed to The Lovin' Spoonful. And the old poll had gone dead, so I put up the same options in a new poll.