(listen from 2:31)
I don't get how from the [D] part's last bar BbM7 (IV)
you could go to the [E] part (Ab/C).
And if you see the [E] part, you could see that I analyzed it as a modulation to Ab Major key.
Because if you see the [F] part, you could see that the chords and the melodies are the same as the [E] part.
So my interpretation is, from the [D] part ( F Major key ), It suddenly modulated to Ab Major key.
But How?..
How did he just went from the [D] part's BbM7 (IV) and just suddenly modulate to the Ab key ?