From Your best stuff:
So, the question: should you put your best song on the free CD?
If it’s your best song, and it’s free, then no one will pay to get it from iTunes. And if it’s the best song on the album, maybe no one will buy the album since they already have the song.
It’s easy to argue that you should hold back the best song, make people pay for that.
Until you realize that the >>> button on my CD player works great.