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With just a little bit of research you can select some very good digital recordings from HDTracks. I'm not a huge oldies fan but a couple I'd recommend are Paul McCartney: Band on the Run (uncompressed) and War: The World is a Ghetto. The Stones ABKCO recordings are good too. And as described in my earlier posts the MF did not outshine the SBT on those recordings.
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Most sound test are best with acoustic recordings and solo passages. that way your hearing is not overloaded with some many things to listen for. The Begining of World is a Ghetto is good but only about 5-10 sec long. Should try a good Hi Rez or even Wav and Flac track of Earl Klugh solo guitar album, Teneray Sutton Band American Road album for voice or any Diana Krall. This will allow you to key in on the details.
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It is also good to tax a system with complexity to hear how the individual details play out. I'll use Patty Larkin's When, and for a quicky one note test, the choked cymbal/kick drum in the intro of Pink Floyd's The Happiest Days Of Our Lives.
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Oh the reason for the limited sound/solo's are for your own ears as humans can only focus on a limited number of sounds at one time :). Your mind will be able to store the info better without trying to filter out other none important passages