I don’t know how to add a link to the Amazon MP3 store for a given song. If I did then I would add that to http://philwilson.org/6music/ and its purpose of letting me easily find out what song is currently playing and then buying it, would be complete.
As it is...
My phone runs an app that idenitifies the song that is currently playing on the radio and an app to then buy and download that song, or the album it’s from. The two are seamlessly linked.
I am probably late to this, but listening to 6music whilst I have both Shazam and the