This technique involves the Picardy 3rd, a technique were the 4 chord goes from major to minor then resolves back to the 1, it's a great sound. It was traditionally used for final cadances only.
I understood this thread to be about using major and minor techniques, which would include, but not limited to, modulation. Here's another Beatles goody.
Michelle
A section
/F /Bb-7 /Eb7 /Do7 Fo7 Abo7 Fo7/C7 Do7 Fo7/C7 //
B section
/Fmin / /Eb- Ab7 /Db /C C7 /Fmin //
The intro vamp is based off a F- chord with a chromatic descending melody line (F to Db) that resolves to the 5 chord (C7)
