I have a method which doesn't work at song level, but for me to find new albums/bands etc I mainly use Amazon's "recommend" feature. It lets you rate albums you have listened to and makes reasonable recommendations.
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock