If you offer three free John Farnham tracks for download, offer three free John Farnham tracks for download. Do not be a piss-ant and pretend you're offering them for free, when really you expect people to download them, listen to them for a week and then buy them. At least if you expect people to download, listen and then buy, explain as such on the first page of the offer, not after wasting precious space of someone's download quota. Doing so is rude and uncalled for. In fact, it is called lying and is not highly thought of around here. I rather think that if you had any common sense, you would have just offered the tracks for free, as you suggested, in the first place - word of mouth and all that.
Your disgruntled non-customer,