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[http://Guitar hero led mod https://www.instructables.com/id/Guitar-Hero-LED-Mod/]
For this project and i need some help quickly so...My questions are: Does this require any resistors with a 9v battery?
Wil it work fine with the regular buttons drilled out(I mean, will it shine through)? And is my wiring(below) correct (the step was kind of confusing)?

Thanks,
Tomonto

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User V=IR
V = voltage in
I = current (this should be dependant on the LED, usually a couple of mA)
R = the resistor value you use
Soo... R = V/I
Butt we usually assume you loose 2v accross and LED so for you i expect it would be:
R = 9-2/(2x10-3)
Just remember to wire the leds in the correct ways round or they wont work (usually + is the longer pin)

Well, clean it up, then! And don't leave any little bits of brain gooping up the forums. Your mother doesn't work here :-)

Heh. Technically, I was being rhetorical (it's a semantic construction which is supposed to be taught in school). However, unless your mother is one of exactly two people in the world, my statement is correct.

I think he was technically being humorous (it's a social construction which is supposed to be taught in interactions with other humans). :-P And more than two people work at instructables...

Humans? What are these "humans" to which you refer? I thought we were all digital constructs interacting via sophisticated pattern analysis software.

But only two females are staff; I'm excluding the intern on the basis of age.

Most LEDs also have a flat spot in the plastic lens indicating the cathode (in this case negative) side.

Use an LED calculator.
--The forward voltage (drop) depends on the LED type. Red LEDs have ~1.8V drop, other colors are somewhat higher.
-- Current is 20mA max for typical LEDs. 15mA is a safe level.

LEDs are current dependent--since the number of lit LEDs will vary, you must use a separate resistor for each LED. And each resistor / LED combo must be connected directly to the battery (not in series.)

Sure wish Instructables had an organizational structure so this question isn't asked 10 times a week...even something like "sticky faqs" would work...