Treble and bass clefs come to life with swirly dresses and handsome vests dancing high and low on the grand staff. The twins are introduced to the two clefs and the corresponding concepts of high and low sounds written on the staff — through imagination, play and listening. They sing and move their clefs along with the story line as they hear the high and low orchestral sounds in the audio tracks. From My First Piano Adventure, Lesson Book A page 52-53.