They, too, are derived from the same four source materials as the main melody.
Although numerous arrangements of the theme have been used on television, the main melody has remained the same.
Another sound was added to the main melody to give it a more "brass" kind of feel.
McCartney later said that he told the publisher they were both the main melody.
The trio is described as the main melody of the march.
Even when used in the orchestra, it is also attributed with the main melody.
It begins with a piano introduction of the main melody.
Sometimes the clarinet takes the lead and plays a variant of the main melody.
The main melody is heard again on piano and flute.
The main melody is played again, followed by a short minor section.