David, that's actually "Without You", Harry's only #1 US single, written by Peter Ham and Tom Evans of Badfinger.
As a songwriter it must be frustrating for Harry Nilsson to have his only #1 hit as a singer be written by somebody else!
Harry Nilsson shot himself in the foot by recording You're Breakin' My Heart. Nothing he did after the album Son of Schmilsson sold very well at all.Harry's been gone 28 years now. The one time I met him, that's a question I didn't think to ask. Actually, his two biggest hits were written by other songwriters. Fred Neil wrote "Everybody's Talkin'".
Well, it wasn't one song that did it. While 16-year-old me and my buddies thought "You're Breakin' My Heart" ruled, the fact is a lot of the SON OF SCHMILSSON album was a self-indulgent, self-destructive move ("Take 54", "Joy", the false beginning to "Remember (Christmas)" followed by a belch, the final line of "The Most Beautiful World In The World", the phony album promo spot and "I'd Rather Be Dead (Than Wet My Bed)").Harry Nilsson shot himself in the foot by recording You're Breakin' My Heart. Nothing he did after the album Son of Schmilsson sold very well at all.