What happens to the pitch when you transpose a melody up one octave?

When a melody is transposed up one octave, every note in the melody is raised by one octave, meaning that each note sounds at a higher pitch. This transformation effectively doubles the frequency of the notes, leading to a rich, elevated sound that retains the original melodic structure but at a higher level. Although the notes maintain their relative positions to each other, the overall auditory perception shifts upward, making the correct answer about the melody becoming higher in pitch.

In this context, the other choices do not accurately describe the effects of this operation. One option implies that there is no change in pitch, which contradicts the definition of transposing. Another option suggests a decrease in pitch, which is not possible when transposing up an octave. Lastly, changing the key refers to altering the fundamental note or tonal center of the melody rather than changing its octave placement, which does not apply in this scenario.