Basic Instrumental Fingering Chart Trumpet. Is ideal for every beginner, Ideal for any private student classroom study or for quick and easy reference while practicing at home. Chart includes a diagram of makor scales, minor scales, trills and the circle of fifths which is essential in learning how to determine the key signature, learning the keys is an imperative element of music study for every student and a solo reason we chose to place so much emphasis on the Circle of Fifths diagram.