still, If you really want to map a song and it has a bunch graveyard maps of it already or maybe one or two older ranked maps then go for it, you will not be able to make anything of rankable quality for quite a long time anyway, and dont worry about how popular your maps are, they are going to suck and you will hate them later.
better to map a song you'll enjoy mapping than settle for a song you think players will like.
probably avoid anime op's from recent seasons though, nobody wants to mod those - there are way too many maps being made of them, and they all usually had a ranked map within a week of the season starting.