Bach, Beatles and ...Maths?

From the rich complexity of the Bach fugues to the catchy songs of the Beatles music and mathematics overlap in all kinds of interesting 44 __________.

Would you believe that research has shown that certain 45 __________ of music end up being more popular and mainstream 46 __________ their mathematical structure?

The link between the physical practice of music and strong mathematical 47 __________ are demonstrated in various studies. They show that kids who play a musical instrument can 48 __________ more complex arithmetical operations than those who do not play an instrument.