Sitting with my grade 10s and a scrap piece of paper, this week I sketched out how keys and their key changes work. This was part of their "Elements of Music" unit, and our current lesson was focusing on harmony, then specifically on keys. The students understood very well and the drawing was very effective... so much so that after class, students were taking photos of my sketch. That's when I realised that this was a resource that needed to be shared!
Now here is the technical information:
This is an annotated infographic created to explain related major and minor keys. In the centre, you have a chord ladder built on C Major, labelled with Roman numerals showing chord tonalities. With it comes an image of its key signature. From there, four arrows point to related keys, including the subdominant, dominant, relative minor, and parallel minor. These examples also contain chord ladders and their respective key changes. Down the left side of the paper, there is an explanation of related keys, borrowed keys, modulations, pivot chords, etc.
This theory sheet is most appropriate for theory learners in upper years, including grades 10 - 12 or Diploma Programme.