Whomever knows a guy with a real good analogue recorder---even the reasonably priced Revox A77, plus some condenser microphones, arrange for him to make you a recording of live acoustic music, the event at which you will be present. Listen attentively to the sound and music the musicians and singer(s) are making, taking notes if you wish. From those tapes burn a CD/SACD (and an LP if you have the disposable income!), and use it to evaluate equipment. From being at the recording session, you have a good idea of what the music and sound should be, much more so than any professional CD/SACD/LP you have. The recording will most likely be far more alive and transparent sounding than almost all of them, having gone through none of the processing commercial product does---equalization, compression, added electronic reverb and echo, gating, etc.
I made such a recording, and have used it for years as source material with which to judge the sound quality of equipment. It was made by myself in a small bar on El Camino Real in Sunnyvale California, the band being a Jump/Blues septet comprised of drumset, bass, upright piano, guitar, tenor and baritone saxes, and singer. The bass and guitar were plugged into small amps, but contrary to the mistaken notion (notably by Stereophile founder and chief-tester J. Gordon Holt) that instruments employing amplification are not acoustic sources of sound, the sound produced by amplified instruments is indeed acoustic---you hear the sound produced by an amplified instrument directly through the air with your ears, it is not an electronic sound source. The sound of an electric guitar and bass, while different than that of acoustic ones, have their own signature characteristics. If you were at the recording, you have heard that sound for yourself.
