Musicians using tube amps makes sense, as the particular distortion of a pair of overdriven 6L6s is a huge part of the characteristic rock/blues "sound". The amplifier and it's distortion characteristics are an inherent part of the sound the player is trying to create.
For REPRODUCTION of recorded music, the ideal amplifier would be a "piece of wire with gain", adding or subtracting nothing from the original signal except to increase it in level to drive speakers or headphones. This is where the use of tube amplifiers (especially the ridiculous audiophool stuff using single ended triodes and no negative feedback) can only DETRACT from the signal as the musician intended it to be heard.
Tube amps are cool in their own right, and many of them are physically beautiful pieces of "functional artwork", but they are not "magical" by any means. It just happens that the particular type of odd-order harmonic distortion created by tubes happens to sound OK to many people. But it IS distortion, and technically is unwanted in REPRODUCING recorded content.