I understand octaves, like 100 hz, the first octave is 25, second, 50, and 100 the third octave. How can I relate all this to chords? I have been reading all this music lingo and cant correspond any of it to frequencies, and alot of the ideas from now today dont match up with the past etc. Also when we get in to consonance and dissonance I dont understand the frequency ratios. Also, is there a set idea of what ratios are dissonant and consonant? What is the difference between major, and minor chords? None of this makes sense to me in the relation of it all to frequency.