Originally Posted by: NickFerrahttps://m.youtube.com/watch?v=pVC2IRFtlZo
The intro lead melody starts clearly in C major with a nice little call & answer (or response) phrase.
Call
|-15-13-12-13-12-13-12-----------------------|
|-----------------------13-------------------|
|--------------------------------------------|
|--------------------------------------------|
|--------------------------------------------|
|--------------------------------------------|
Answer
|-15-13-12-13-12-13-12--15-------------------|
|--------------------------------------------|
|--------------------------------------------|
|--------------------------------------------|
|--------------------------------------------|
|--------------------------------------------|
Which works nicely over what sounds like just an F - C chord prog. Then there's another Call, but a different answer over the G chord.
Call
|-15-13-12-13-12-13-12-----------------------|
|-----------------------13-------------------|
|--------------------------------------------|
|--------------------------------------------|
|--------------------------------------------|
|--------------------------------------------|
Answer over G
|--------------------------------------------|
|--------------------------------------------|
|-0-4-7-12-7-4-0----4-5-4--------------------|
|---------------------------5----------------|
|--------------------------------------------|
|--------------------------------------------|
It sounds like it's an open g string with hammer-ons & a tap on the 12th fret of the g string. You could also play it like this.
|-------3------------------------------------|
|-----3---3----------------------------------|
|-0-4--------4-0---4-5-4---------------------|
|--------------------------5-----------------|
|--------------------------------------------|
|--------------------------------------------|
Either way, it's just an arpeggio, playing the notes of the G major chord one at a time while the rhythm guitar strums the G major chord. Then a nice little suspension ornamentation with the 3rd-4th-3rd-root of the G chord.
Hope that helps!