Prelude No.1 in C Major, BWV 846
(from Well-Tempered Clavier, Book 1)

by J.S. Bach

focus-and-play range:           start at measure:                note: k-th phrase begins on measures 4(k-1)+1

MIDI notes visualization of Bach's famous Prelude No.1 in C Major from WTC Book 1.
Features "focus and context" method that allows viewing and listening of a specified region in music, while maintaining the context of entire piece.
The audio playback is synchronized with the user-specified focus-scope and focus-starting measure.

This time-series line graph visualizes chord transformation as the piece progresses: the bass note of arpeggiated chords begin on C4 in m.1, and gradually moves down two full octaves to land on C2 in the final measure. We can also view how the dominant (G2) serves as a prominant anchoring note during the second half of the piece, intensifying the listener's anticipation of resolution on the tonic.

Browser Requirement: Firefox or Safari with recent QuickTime plug-in (7.1.5+). Chrome and IE do not seem to work.