Since no one has chimed in, take a look at the LM3914. It can light LEDs at different frequencies. Also you can daisy chain them to get a higher range of frequencies.
1 - Have like 3 colors of lights and each one is activated by a range of sound frequency, lets say:a --- Red for kicks/basslines;b --- Yellow for claps/snares;c --- Green for Hihats(the colors and quantity are just examples)So basically it would work kind of like an equalizer;
2 - Have one color for each instrument in a band... ... i guess I had to bypass each mic before it goes into the mixer so each one is activated individually and still can mix the sounds on the mixer);
3 - Having a set of lights respond to one single instrument and each color would correspond to a range of notes...(from my knowledge of music, each color would represent a range of sound frequency);
4 - Have a light blinking in sync with a " dubstep wobble bass" (i have this doubt just because it isn't the volume, its a frequency/LFO effect).
I hope I didn't made it hard to understand.Therefore, like i said previously, I want to know if each topic is possible and the necessary gear and also if i can combine some (like 2 with 3 and 1 with 4).
Lights can be El Wire or LEDs, I suppose i can use one or another jsut by making slight adjustments to the circuit/layout.