I never buy mp3.
I buy the cd or dvd, usually I do a search and compare the offers. If it is an unknown artist I prefer to buy straight from the artists website if they have any.
If I want a pre-listening I use the free " possibilities" and if I like it, then I buy the cd.
Fred
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76