This document provides a lesson on major flat key signatures and their corresponding flat scales. It begins by introducing major flat key signatures and scales. Then it discusses the C major scale as having no flats, followed by the F major scale with one flat, B-flat major with two flats, and so on up to G-flat major with six flats. It provides the order of flats for each key signature and illustrates their location on the staff. Finally, it asks students to name key signatures by number of flats, order the key signatures by number of flats, and answer questions about which key signatures have specific numbers of flats.