The Amazon Digital Music Store is a digital music store that sells MP3's that are encoded at around 256kbps.
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Pro Amazon recommends other bands purchased by customers who purchased the current music listed
Amazon has a feature called "Customers Who Bought This Item Also Bought" that will show artists that customers purchased who also purchased the current artist shown.
Pro All songs can be previewed
Amazon has a play button next to each song that allows for all songs to be previewed, enabling the listener to tell if the music is any good.