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 Other users suggested that HDTracks was relying on a clunky 
download tool, but I have no idea if that's true or not.
HDTracks has a great product that they insist on saddling with a 
ridiculous, Rube Goldberg inspired download procedure. I seem to 
recall that at one point early on they relied upon open industry 
standard download procedures to access the material customers had 
paid for. At least I was able, as a linux user, to easily download 
and play their music on my linux box. I was very impressed with the 
quality and bought several titles and, where available, individual 
tracks. They were all outstanding. I planned to buy a lot more. Then 
at some point they inserted this insane, convoluted download 
procedure, that SOMETIMES actually worked on linux. Currently it 
doesn't. 
This is a company with a great product that is maddeningly 
frustrating for linux users (we're generally a fairly technically 
sophisticated bunch). Barring some major change in their download 
procedures and/or attitude towards linux users I'm afraid I won't 
be doing any more business with them.
This is really a shame, given the high quality of the product, and 
even more so considering that one time these barriers to access did 
not exist. I have even heard rumours that a native java version 
existed internally at JRiver (their download manager provider) that 
ran natively on linux.
Too bad.