This Google Slides presentation gives a thorough explanation of key signatures: what they are, what they do, how to read them, and how to find the major keys they represent; as well as the Orders of Flats/Sharps and the Circle of Fifths/Fourths. It also includes a lesson script in the Speaker Notes embedded in the Slides file (you can view these in editing mode by going to Insert >> Show Speaker Notes; or in presenting mode by hovering your mouse near the bottom of the screen until the Too