I'm posting this link here so I remember to click through each week. This is what they say
At Amazon MP3, we do our best to provide the best prices along with a selection of over 8 million songs. This includes a large selection of albums under $5 and hundreds of free songs which have proven to be a special treat for all kinds of music fans.
So I'll be clicking and posting as to what's free each week - especially if they'll inspire me to go longer on the treadmill !