I've recently discovered the Captain and Tennille. When their show was dropped, she sang a lovely little song she and Captain wrote with a beautiful melody called We Never Really Say Goodbye.
They did a lot of love songs together. It's too bad she ended up divorcing him late in life when he became ill from a debilitating disease where he could no longer play.
Toni had it all, looks, voice and trained piano/keyboard player. Captain usually did the keyboard but sometimes she did.
I heard of them years ago but wasn't paying attention.
Karen and Richard Carpenter surely did a farewell song, but I can't think of one.
Two sides to every story: