I call it progressive because
C major is not part of the A major scale so it gives the music an uplifting sense of drive, before it sinks back down to A:
The theme above uses notes from an old classical trick called a horn call:
The old hunting horns used to have a very limited range of notes, so when they moved around in pairs this was a common way for them to do it. Strange place to find it, but there you go.
Chords Used in George Winston - Linus & Lucy
Sheet Music to Buy by George Winston
George Winston Piano Solos "By George Winston. For solo piano. Piano Solo Personality. Exact transcriptions from the recordings, authorized by George Winston. New Age. SMP Level 7 (Late Intermediate). Songbook. Standard notation, fingerings and introductory text (does not include w