It's the first full week of term at Farthingbottom School and Portia, Felix, Primula and Randolph have arrived in the music room for their lesson. Professor N. Igma is nowhere to be seen, but he has left a message on the blackboard for them:
This term we will be performing four pieces of music at the end of term concert. Please practise them. Two methods will be required.
On the desk at the front of class is a single musical score:
The children get out their instruments and try to play the music, but it sounds terrible.
Question: Can you determine which four pieces of music the children should be practising?