harmony notes in the beatles

Question 1

general harmony

Answer 1

all songs!

Question 2

chords I, IV and V/

I, IV. V and VI

Answer 2

chords 1, 4, 5 and 6 of the key the song is in
eg. in C, C major ( C D E F A B C) - chord 1 (tonic) 4, (subdominant), 5 (dominate) and 6 (sub median) are the chords C(1), F (IV), G (v) and I (Am)

Question 3

discord

Answer 3

a chord that has clashing notes