This is the diagram I've been using- I got it online then added the number of sharps and flats next to each note: I've been making some study sheets for myself, and had a few questions about some things and for the usefulness of adding some stuff to this diagram. 1. Are C# and Cb used rarely enough where I shouldn't need to add them onto the sheet on the first circle? It would seem much easier to use always use Db and B, but I didn't know if there was any good reason to add them on (other than that they represent the scales with 7#s and 7bs). 2. I'm also writing scale sheets of the majors and their relative minors to go along with the circle. Should I not include the Cb major scale? I could add C# to the relative minor side of the sheet because it's also the natural minor of E, but I don't see where Cb would fit in other than if you include it in the outer circle because of its 7bs. If I don't add the Cb major scale, I imagine I wouldn't add the C# major scale and the A# relative minor scale as well. Is this advisable? 3. I've seen a circle of fifths designed like this before: This would be a bad representation of the circle because it shows only the sharps and could be confusing because of it would repeat the number of sharps listed on the other side of the circle (ex. the keys of both A# and D would have two sharps), correct? Because of this, do you never see songs with key signatures of A#, D#, G#, etc., to avoid confusion as to what key is being played based on the staff diagram (so if you saw two sharps written on the staff, you'd know the key was D and not A#)? If so, should I not include the A# scale? 4. I was thinking about adding on the enharmonic equivalents to the whole left side of the circle in a smaller font and in parenthesis. That way when I glance down at the circle to see what notes make up the B major scale, I could easily see the five sharps that it's made up of rather than having to think of the enharmonics of the flats that are normally listed. Or would you suggest I just memorize the names of both notes of the enharmonics better so I don't need the added lettering? Thanks guys.