The first Green Day song to ever feature harmonica: Walking Alone. And it was played by Billie Joe Armstrong himself.

You may notice the use of an E5 chord below. Generally we don’t use 5 chords, because since it’s Green Day, we would wear off the 5’s on all of our keyboards. However, in this case, we did, because this is one of those instances where the use of a major or minor chord in its place would be sort of inappropriate, due to the nature/structure of the song. Whatever. Just take our word for it.

Green Day - Walking Alone chords

And then it goes into an instrumental part that is the same chords as the verses and then back into the chorus, and then back into the G – E5 thing (x4) and then it’s quittin’ time.