Bell A carillon, which is a musical instrument consisting of at least 23 cast bronze cup-shaped bells, is tuned so that the bells can be played serially to produce a melody, or sounded together to play a chord. A traditional carillon is played by striking a baton keyboard with the fists, and by pressing the keys of a pedal keyboard with the feet. The keys mechanically activate levers and wires that connect to metal clappers that strike the inside of the bells, allowing the performer to vary the intensity of the note according to the force applied to the key. In
A Sermon, a Narrative and a Prayer that each six-note set begins with the same note . For example, the first hexachord of the inverse form of the row has an interval succession of 11–4–10–1–3 semitones, plus an interval 7, wrapping around from the last back to the first note. By moving the first note in each hexachord to the end and then transposing the result to begin on E, the rotation scheme produces: Stravinsky then in many cases would travel systematically through the array to derive long melodic lines, as he does with this array to produce the canonic passage in the alto and tenor voices