It doesn’t require “deep knowledge,” but it does help to be a musician… If you can’t play-along in-tune with the recording, the song uses a non-standard tuning. What I am not sure about is how to find out if the song i upload into audacity is in 440 hz or not, is there a simple way to do this that doesn’t require deep knowledge of music to get your head around please? I just found 5 Great Out-Of Tune Recordings.* As far as I know, mis-tuned recordings are usually only guitar, bass, or vocals (easy to mis-tune). I’ve heard of some songs that were slowed-down or speeded-up, either accidently or intentionally, or that were mis-tuned and these may not correspond to any known-standard scale. Note that a song tuned to A=440 might not contain any A-notes. It’s not as unusual use non-standard tuning on a guitar, but the new tuning is usually from the 440Hz standard (so you don’t have to re-tune a piano to play along with the re-tuned guitar, you just play different notes).
It’s easy to re-tune a guitar but I doubt you can even find an A=432 guitar tuner so you’d have to use an oscillator or computer. Some instruments (horns & woodwinds for example) can’t be re-tuned and it’s not really practical to re-tune a piano. If you’ve got Indian or far-Eastern music, you may have an entirely different scale.
I’d guess that more than 99% of (modern Western) music is tuned to the A=440 standard. I’ve recently read an article that states most music is recorded in 440hz but not all.
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