I'm very interested in music but never took a class or learned notation or theory. This appeals to me because it has always irked me that people would write dow

I'm very interested in music but never took a class or learned notation or theory. This appeals to me because it has always irked me that people would write down songs like Twinkle Twinkle Little Star or Happy Birthday as if they start on certain notes. They don't. They start on whatever frequency you want. The frequencies and lengths afterward are relative to the first whatever-you-want-to-call-it.