The famous, seemingly simple 'Da-da-da-DUM' rhythm runs almost constantly through the piece, like lettering through a stick of rock. How many times do we actually hear it in one performance?

The opening movement of Beethoven's Symphony No. 5 has to be one of the most enduring 'ear-worms' of all time. It is known all over the world and regularly appears in culture including pop music, film and television.