Sound code help please

I am working on a school project and this is my first time using an arduino and I have zero code experience. My project involve make a wall tuner for a guitar. I basically want individual different el wire to light up when the proper note is hit, and then a separate RGB LED to light up red or blue, depending on if the note is sharp or flat. I have researched and researched and still feel completely lost.....I have found Goertzel's algorithm, but it looks like a foreign language to me and I do not know what to do with it. Any and all help would be greatly appreciated.

Thanks Jenea

You could measure the time between adjacent rising edges. That gives you the cycle time which is the inverse of the frequency:

Concert A (440 Hz) would have a cycle time of 1/440 Seconds (2272 microseconds).

You could then use a table of the six desired frequencies to see which one is closest.

Use the forum's Search to look for guitar tuner

Pete