OK, so yous two, 'Lain and Lumbadeano, have chosen some seriously good slushy stuff as your possible all time favourites.
Here's probably my fave.slush One of the very best and possibly my favourite male vocalist of the 70's. David Gates.
Makes me go all sad now listening to it, bringing back those memories.
http://www.youtube.com/watch?v=_MaczkqNPBI