Probably a little more than usual, but before pop/rock artists came to be their own creative outlet, the song itself was the industry's currency of the realm, and like all such things...
One of the more convoluted tales is that of that na-na-na-na-hey-hey-hey-kiss him goodbye song and the group that released it, Steam: http://www.allmusic.com/artist/steam-p25372/biography
Don't know how I would have liked a Spector verion of "It's My Party"...either Barbara Alston or surrogate-Crystal Darlene Love would have done a great job, and I love Spector, but....