If that is correct (which I do not doubt), it would mean those who try to misuse the network with those artistdirect re-directions have already adapted whatever they use to get those files appearing in the search results.
Guess, we have to see and wait whether others will report similar experiences.

Of course, the use of the filters will, in the long term, get rid of them anyway; but as you said, that might take some time.....

Anyways, thanks for leeting us know......

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"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"