Book excerpt: The Low Brass Player's Guide to Doubling is a guide for low brass players who wish to learn a different low brass instrument. By performing well on several instruments, doublers become more complete musicians, regardless of the instrument being played at any given moment. Taking up a secondary instrument will introduce you to new composers, repertoire, and ideas that will enhance your musicianship. Doubling necessitates more thoughtful playing and leads to more thoughtful teaching; your resulting instruction becomes more effective on every instrument you teach. Playing more instruments will also increase your earning potential!The Low Brass Player's Guide to Doubling includes chapters devoted to: tenor trombonists doubling on bass trombone; bass trombonists doubling on tenor trombone; trombonists doubling on euphonium; trombonists doubling on tuba; tuba players doubling on euphonium; euphonium and tuba players doubling on trombone; alto trombone; contrabass trombone; bass trumpet; and cimbasso. Also included are fingering charts, overtone series charts and targeted fundamentals for each instrument. The targeted fundamentals are designed to help players learn the new instrument efficiently by extracting fundamental skills unique to the new instrument.