Proper listeningt tests are LONG TERM MEMORY TESTS using musicians, acouswtician or trained music lovers...
That is a myth and insult to many audiophiles who don't consider themselves any of those.
Nothing about a controlled test says you have to do short term testing. You think a cable sounds different? Spend a month listening to it and another month listening to another. As long as you don't know which cable is which when listening, and repeat the test enough to know you are not guessing, you are performing a valid test.
Now, we encourage you to not rely on long term memory as it is an extremely lossy system and sharply reduces your acuity when it comes to hearing small impairments/differences. This is backed by medical science (look up echoic memory), and controlled listening tests. Please see this summary of an AES paper on this topic:
AES Paper Digest: Sensitivity and Reliability of ABX Blind Testing
The results were that the Long Island group [Audiophile/Take Home Group] was unable to identify the distortion in either of their tests. SMWTMS's listeners also failed the "take home" test scoring 11 correct out of 18 which fails to be significant at the 5% confidence level. However, using the A/B/X test, the SMWTMS not only proved audibility of the distortion within 45 minutes, but they went on to correctly identify a lower amount. The A/B/X test was proven to be more sensitive than long-term listening for this task.
I have done a ton of such tests. The longer the switching time, the more sensitivity I lose. Again, this is due to our short term memory being almost lossless compared to the highly lossy long term listening.
Once more though, you are welcome to take as long as you want in comparing products blind.
As to you putting your fait in certain group of people, that again is false. I showed example of how audio reviewers did so poorly in blind tests of speakers.
As to Musicians, while they hearing does get trained in certain areas (e.g. detection of reflections in a room), they do no better than general public when it comes to matters related to audio fidelity. If they did better, then they would mostly be audiophiles which they decidedly are not. My piano teacher for example just gives me blank looks when I talk about anything related to audio fidelity! Musicians listen to music from a spot in the performance venue that is different than us as listeners anyway.
As to those "trained music lovers," when tested in any kind of blind test, they do very poorly. Most would not dare taking the same tests that I have taken and passed. It is entirely too convenient to declare yourself as trained with no proof point whatsover.