Musical Mathematics

As we approached this puzzle, there was a cacophony of music. There were four loud speakers, each playing different music. Between each speaker was a giant symbol, a plus symbol, a pair of clocks, and two birds. The first speaker was playing Beethoven Fifth Symphony, the second was playing "Three Blind Mice", the third was playing "Tea for Two, Two for Tea. The fourth was "76 Trombones."

 

The clocks were showing times. That mean multiplication, as in 5 * 3. The birds were Myna birds, or Mynas, or if you stretch, minus. The calculation gave you the answer.