Is there a color code for music notes? Yes, however color coding for the notes is not standardized. So, there are many, many color coding systems.
For example, you have the figured notes system (see the video above).
Or you can read about Margaret Hubicki’s system in this book:
And you have extensive color used in this little kids’ piano series:
Of course, you also have colored stickers that can be applied to instruments or even colored instruments themselves:
Finally, you have my teaching system that uses color coding to help students read the score:
While all these color systems color code either the sheet music or the instrument, none of them uses the same arrangement of colors for the notes. This means that if you want to, say, use the color coded stickers for guitar, they’d be colored different from how it’s shown on this site.
Therefore, if you wanted to use the teaching strategies from this website, you’d need to adjust the colors to work with the guitar stickers, or the piano stickers, or the Music for Little Mozarts books.
However, you couldn’t make them work for all three. The following video talks about how color coding can be an effective music teaching aid.