Thanks for the response listinidlewonder!I embarrassed to admit that I don't even know what the name of different scales mean.Key signatures I have never heard of either.When you suggest Bach's Well Tempered Clavier, are you referring to the entire piece? The first part is easy enough...I would love to "see shape at the keyboard based on notes on a page".
A key signature is those sharps or flats on the left side, before the notes start. E.g. a sharp sign on the line for F means to play every F as an F-sharp. In any octave, not just the ones on that line. Compare that to a sharp sign that appears next to a note, which means to play only those notes in the remainder of that measure as sharp.When you transpose from one key to another you need to add sharps or flats in order to keep the intervals the same. Otherwise a song that sounds fine when you start on C will sound funny if you start on D. So if you're going to play a song in the key of D, you'll add a key signature with F-sharp and C-sharp to tell the musician that you're in the key of D, and that all the F's and C's should be played sharp (unless otherwise noted in the music).There's a logical progression to the sharps and flats. For instance, the G major scale has an F-sharp. D major has an F-sharp and a C-sharp. In the key of A it's an F-sharp, C-sharp, and a G-sharp.See the pattern? Every time you add a sharp, you don't change the others. Any key that has at least one sharp will always have an F-sharp, and so on. Same for flats.So it might help to practice adding one sharp or flat at a time-- practice C major, then add a B-flat and practice F major. But, really, you just have to pick a key and pound away at it. Do scales and chords. But also transpose simple pieces of music into different keys. For instance, "Twinkle, Twinkle", starting C-C-G-G-A-A-G, then D-D-A-A-B-B-A, then E-E-B-B-Csharp-Csharp-B... Transposing is something you should learn, anyway.Play simple songs in other modes, like "Twinkle, Twinkle" in C-minor (same key signature as E-flat major: B-flat and A-flat). You can get some really interesting sounds that way.Every major key has a natural minor. The white keys from C to C are C major, and from A to A are A minor. Same keys, different order. If you want the key signature for a minor key, count up three half steps. E.g. A to A-sharp, to B, to C: use the signature for C major. Or for C minor, C to C-sharp, to D, to D-sharp=E-flat: use the signature for E-flat major. And that makes the minor keys a lot easier to learn!You can find key signatures, scales, and chords on the internet if you Google around a little. Or you can reason it out by counting white and black keys on the keyboard. Or you can sound it out, experimenting until your ears tell you that it sounds right.
I think something that will help you is when you pick a piece, go online and look up the key signature. There are sites online where you can download the scales and chords to any key signature. Then going into the new piece also practice the scales and chords sheets. You will find them to correlate well with your new piece because the new piece is in that key signature. Do this by simply counting the sharps or flats at the beginning of the piece. Type something like ( lets say there is one flat) into your browser, "key signature with one flat". Do the search, you will find pages for one flat in major and relative minor keys. It won't be difficult to figure out which your new piece is in, print that and work on it.This shaping you want to come to you will come to you. Just put in the effort and time, it won't happen overnight and maybe not even real quickly but it will happen if that's what you want to happen and go to work on it.Teaching your son. Take it really easy with him. I just started with my grandson who is 6, we just started last week. He now knows where every C note is on the piano. That's it, lesson number one ! However, he has a bit of a learning disability and is also left handed. I'll go as far as I can with him, it may go very well or it may not. That remains to be seen. What he does have though is good hand coordination and can associate something on a page to his hands well, so I'm hopeful this will be successful. I told his mom all I can do is try but we are going by Braille here, so to speak.
As for your suggestion about looking up scales: since I'm working on Moonlight Sonata, 1st movement, would that be considered an E major scale? If I google E major scales, one of the first links is this: https://www.basicmusictheory.com/e-major-scaleThere seems to be variations of the scale on this page. Is this about what you are referring to?
So if the key signature has four sharps, it is either E-major or C#-minor? So from what I can gather, E major will be E, F#, G#, A, B, C#, D#While C#-minor will be C#, D#, E, F#, G#, A, BUgh. I feel like I should take a beginning course in piano theory.
So when you say "G major", that means playing a scale starting with G? So G, A, B, C, D, E, F-sharp, G. What makes D major the next in line for sharp key signatures? I see that you said A major is the one in line after that. Is it every three letters? So four sharps is considered E major?