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Knowing a little about music notation will help you out a lot here.
Tuba players often have to count a lot of rests, especially in orchestra music, because composers are idiots.
There are three digits in the solution. Each card gives a part of the solution number.
The only Respighi piece many people know is called Pines of Rome, although he wrote two other famous Roman-themed pieces and plenty of other works. You should listen to Pines - it's awesome.
The two notes on the Respighi card are a D and a C.
The tuba part card shows a 17-measure piece with rests for the first 16 measures. It's written in 5/4 time, so a poor neglected tubist would have to count out five beats of rest in each rest measure before playing her one awesome low B-flat. She would likely play it more loudly than necessary.
The interval on the card with math is a major 3rd.
D and C are both Roman numerals.
DC = 600. The tubist counts 80 beats of rest. One divided by a third = 3. What do those make when added together?