This beloved Beatles anthem uses just one chord from outside the major scale. It's the b7 chord which we study in IFR Jam Tracks Level 4 that gives us the classic sound you know from the chorus to this song.
Where do we study these chords?
Every single one of the chords to this song is covered in the IFR Jam Tracks series. Just working through this series will give you the ability to improvise beautiful, melodic solos over this song and many others. To master all of the chord concepts that appear in this song, you'll need the following levels of the IFR Jam Tracks series: