[Realview]

The criteria I would use is whether the music helps to draw the spirit inwards and upwards or does it draw the spirit downwards and outwards. If it is diffusing the spirit into matter it is technically a waste of the spirit and misdirection of energy. If it draws the spirit inward and upward it is uplifting and draws the spirit and the lower mind towards higher levels. If it draws the spirit outward and downward it may be enjoyable, invigorating but what is felt is your own spirit being wasted on it's way to dissipation. It is part of the traps laid by the powers of illusion in this prison.

At best, music, here, can never do anything more than inspire. What exists at this plane, can only influence the consciousness here at this plane. Continually listening to an outward sound while practicing any kind of spiritual (withdrawal) practice is like trying to swim upstream dragging a boat anchor.