This tune is entitled "Matsurika" or "a jasmine blossom". It came from China into Japan in early 1800s.This is an older version of Chinese folk song "Mo Li Hua".I made this MIDI file viewing an old music book entitled "Gekkin Gakufu" (view the photo at "Mo Li Hua" of Wikipedia) which was published in 1877 in Japan.
Chromatic modulation in Bach's Du grosser Schmerzensmann, BWV 300, m. 5-6 transitions from FM to dm through the inflection of C to C between the second and third chords. Note that there is no common chord.
Author: Image: Created by Hyacinth (talk) 03:29, 21 March 2010 using Sibelius 5. Music: Bach