Composer: Yann Tiersen / Composition: La Valse d'Amelie
This musical composition is a perfect example of a song written in the key of C major. The piece has a bright tonal quality that is pretty consistent throughout the entire song. If you take close notice, you will find that the pianist does not strike any black keys. This tells us that the key signature for this particular piece has no accidentals (no flats, no sharps).