What is the point? They MIGHT listen to it. And then, they MIGHT think it will sell.
It doenst matter if they like the music or not, all that matters is if it will sell. If pigsnorting was the new sound, and you sent in a cd with some good pigsnorting, you'd have better chances than if you sent in a CD with some really really good apalachian indie-pop folk.
Therefore, only send demos to labels that you know sign your kind of music. A rap label will not like irish folk, and similarly, a folk label will not like metal.
THINGS TO DO BEFORE SENDING A DEMO TO A LABEL
-have a fanbase (this is where myspace is crucial)
-have a close to pro CD. Dont send in a tape of your 4-track recordings. Most labels expect quality in a demo cd
-have sold a few CDs, and be able to show that to the label
-have gigged
-have been reviewed in local papers, blogcritics, etc.
-have been played on the radio (college stations, local stations)
-generated some buzz
If you have all of the above, then sending a demo to a label has a point. You have to sell yourself to the label, and you need the above to do just that.
Mike