Final answer:
In music, adding up the durations of notes from left to right on a note tree gives you the total duration of the notes on that level.
Step-by-step explanation:
In music, if you add up the durations of notes from left to right on any level of a note tree, you end up with the total duration of the notes on that level. The note tree represents the rhythmic structure of a musical composition, with each level representing a different subdivision of time.
For example, let's say you have a note tree with a whole note, two half notes, and four quarter notes on one level. The durations of these notes would be: 4 beats (whole note), 2 beats (half note), 1 beat (quarter note), 1 beat (quarter note), 1 beat (quarter note), and 1 beat (quarter note). Adding up these durations, you would get a total of 10 beats, which is the duration of the notes on that level.