As somebody learning guitar and focused on fingerpicking... One of the things that bugs me about Ultimate Guitar tabs is that there are many places where it would help me better to learn to read the tabs if the relevant chord were displayed over the measures/notes. I'm not sure where you are going with your project, but I thought I'd just mention this since I spend a lot of time deciphering the tabs just to figure out what chord position my hand should be in.
Chord symbol, or chord shape? I'm guessing the latter, because that would tell you: put the left hand fingers in these places, and most of the rest of the tab for that measure would just be which of those notes you pick.
But that's not useful. So you're saying just put on a CMaj13 grip for playing anything in a scale to the OP? On your 7 string guitar?
EDIT: Also you have to be missing at least one note... CMaj7 had 4 notes + 13 ... c e g b + a (the 13th) so CMaj7/13 Add 4 ?
The OP (as I understand it) was wanting to be able to know what shape/grip to use for picking the relevant notes... I'm sure it can be done but you have to also find the position and reasonable shapes that fit the notes in the bar.
I’m not sure if you use Ultimate Guitar, but if so, go look up a simple fingerpicked song, like Helplessly Hoping, by Crosby Stills and Nash. If you look at the chords… well, that’s a straightforward view mostly for people interested in strumming. The chords are listed above the lyrics and the chord shapes are listed at the top. This is all relevant info.
Then look at the Pro tab. The fingerpicking patterns are shown, and which string/fret should be picked, but there’s no chord name listed when it would be helpful for somebody like me to see just a simple chord name above the measure as a cue for my fretboard hand without having to look at the individual plucked strings/frets spread over the measure to determine the chord. I hope that makes sense.
Sometime it might be a challenge to fit it, but there are many instances where it would be a helpful assist for reading the tab.
In your example the tab is strictly finger-picking over chords since that's how the song goes but some tabs are lead guitar tabs which might be sliding from the 15th fret to the 3rd fret or other things that are not strictly picked from a chord shape. They might still be "from a chord" or "played over a chord" but when you play the tab you may or may not be using that shape at that position. It's still good to know what's the context so definitely having the chord is useful.
If I'm playing a song with a clear picking pattern over chords I might just learn the chords and strum them first and then learn the pattern or often the patterns are just standard and all you need is the chord chart.
