One of the most confusing and maligned aspects of music theory is the nature of transposing instruments. Few topics frustrate students more. Transposing isn't difficult, only misunderstood. When you learn about the instruments and their transpositions, you also can learn about their musical range, how to write for them, and how to analyze music that contains mixtures of transposing versus nontransposing instruments. It is important in the study of music to know that what you see isn't always what you hear.