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!