It exists and was active till 2013 cwww.edenwaith.com/products/guitar/
If some likes to push a homebrew cask package for it, here is a possible source:
cask 'gui-tar' do
version '1.2.4'
sha256 'e11177b99a01d5cff666f68072fd2145cccda4678a8a98203d97929cbe53dea2'
url "http://www.edenwaith.com/downloads/guitar.dmg"
name 'GUI Tar'
homepage 'http://www.edenwaith.com/products/guitar/'
app 'GUI Tar.app'
endI had a similar thought. This project should have been named "Gitar".
Re:Guitar – Git GUI Client
by AkihiroSuda on Wednesday April 22, 2020 @04:01PM
(#22949582)
"guiTAR is a generic archive tool, written in GTK+/Gnome, supporting plain tarballs, tar.gz, tar.bz2, slp, zip, lzh, arj, and rar format. "
https://www.freshports.org/sysutils/guitar/
http://web.archive.org/web/20020401054755/http://artemis.efe...
Well, I went a different way at first.
I was trying to figure out if it used git somehow to manage creation/rendering/storing of guitar tabs or something.
I kept looking for any images of guitars or screenshots of standard music notation and tab.
Then I finally read the title and part of the README.
:-D
As a developer I love good GUIs and should check this out.