The first three notes of the theme are:
* F# (middle C)
* G# (middle C#)
* A (above middle C)
These notes are then repeated with a slightly higher octave and then with a slightly lower octave. This creates the familiar ascending and descending "call and response" feel of the theme.
While the French horn is the most prominent instrument in the opening of the theme, other instruments, including the trumpet, contribute to the overall sound of the "Star Wars" theme.