Studies over Beethoven's Sonata n. 14 (moonlight) to create different variations for gipsy guitar and sitar for the first and third movements.
On a simple kind of elucidation: "In music, variation is a formal technique where material is repeated in an altered form. The changes may involve harmony, melody, counterpoint, rhythm, timbre, orchestration or any combination of these." (Wikipedia)
Check out Pelissa's variations on Moonlight Sonata at:
youtube.com/watch?v=jIIusyRvUoo (first mov.)
youtube.com/watch?v=nYRE6ZcVup4 (third mov.)