Journalist, I was happy to see that you said let the customer decide. I don't care how much an installer may think they know their customer but I'm certain that the odds are very low that your high-end customer is going to be impressed with Guns-N-Roses. What a great way to ruin your reputation in an instant.

When in doubt leave the hard stuff out.(Even if you don't think it's hard) You can work your way up slowly as you acquire the customer's taste. I once saw a guy crank up Howard Stern as soon as the tuners were up and running! What the hell is that? Do you know how that will change an NPR listener or a Jazz buff's opinion of you and whether they're going to refer you to a friend?

Of course if all of your customers are the same white-trashy-trailer-parky-Wrestling-Loving-Got a spot next week on Jerry Springer-It's Ok you can spit your chew in that paper cup there-You might be a redneck Type of customer.... Well then crack some beers and fire up the Guns-N-Roses!

I'm afraid your awareness of the necessity for a wide selection of demo music isn't shared by all.