On the website for my local NPR station (91.7 KXT, Dallas/Fort Worth) they have a playlist that shows recently played songs and the only option to "Buy Song" takes you to iTunes. I'm assuming they get a share of the revenues from songs purchased and I wish they would link to Amazon or Google Play instead so I could help support. They've introduced me to a lot of good bands and I buy a couple songs I hear on the station a week.