What Joe Offer said about "done to death" songs that get dropped but come back later if they're good is right. And I agree with Shambles that it is counterproductive to sing or otherwise promote a song other than on its merits. Pickling springs to mind. There are quite a number currently languishing on the compost heap that I hope fervently no-one ever tries to revive. Of course, there may well be some, as McGrath suggests, that haven't survived but deserved to have done. Never mind, if they were that good, someone's bound to write them again...