1. The problem statement, all variables and given/known data What I want to do is have a piece of metal, then determine the length to cut it to produce the note Middle C, and so on for an octave (exclude sharps and flats). So pretty much a xylophone made from scratch. 2. Relevant equations v = f(lambda) 3. The attempt at a solution I just randomly cut the metal, and it sounds nowhere near the real notes I'm trying to achieve. I know I need to find out the wavelength, but I have no idea how to calculate the frequency without a frequency meter.