Music can be used as a trigger. However a more successful method is to create a trigger using memories of your successful activations. Getting yourself back into that state with a personal trigger similar to snapping your fingers to get you back into that state.
Noobie your brainwaves are affected by music and for photoreading there is an ideal state you are trying to maintain. Heavy metal type music will pull you out of that state. If you insist on using music be very selective, you will notice that most people are partial to alpha/theta brainwave enhancing music. I considered your selection of "loud comp fans" a poor choice because of additional information you provided.
Alex
