I did the whole kit when taking lessons as a kid, if that even matters. It's just the more songs you know the more chords you know! Early on I did sight reading in different positions just to " Learn " the guitar neck and like everything it at first it was boring but after a while it became fun! Also, I remember getting these stick things that you put on each fret telling you what notes were where. Nothing was ever better than being a guitar geek. 50 years later I still am but even more .....
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Ok...this will showcase my handicap, but in general, I can look at the neck and based on the fret markers, I know what note pressing a string at that marker will yield as well as the frets in between.
When I hear a guitar solo, I can literally see it playing out on a fretboard in my head.
In the studio, when i am asked to compose a solo, I listen to the song and get a feel for the mood of the song. Then I hum a solo that I feel "fits" the mood. I dont think about patterns. I dont think about scales. I think only of the melody.
As long as I begin and end on the correct notes, any note - even dissonant notes - can be played in between the chord changes. My producer calls this "landing on your feet."
I do not know scales. I only know how to create a melody by putting notes together. I tried memorizing scales and found it confusing.
A good example is my improvised solo to our rendition of Rainbow's Stone Cold.
I was playing Blackmore's lead note for note and the engineer asked how I would play the solo if I had written the song. My answer was simple; "I'd make it more melodic."
So, I composed a solo and laid it down in one take.
Here's the solo with our backing instruments followed by the isolated, solo-only track:
Listen to STONE COLD SOLO ONLY by Von Herndon on #SoundCloud
I'm not saying this is a fabulous solo, but I feel that it was more melodic than Blackmore's and it was composed just by humming it...