Seems harsh. If you really want to hear a song from a band, wouldn't you already like their page? Or be willing to like it? If it comes down to it you can always, I don't know, unlike it later.
The thing is, I don't "really want to hear" it. I've never even heard of this band before. I just think it's a ridiculously cheap way of getting facebook 'likes' and I hope that trend dies off soon.