Reviving tablature-mode.el -- license issue?

[Qiantan Hong]

I’ve been always wanting a good music notation software in Emacs.
I just came across this 
https://gist.github.com/mjkramer/171ff6af9c66404a81e38d2015848903
(for tab, not standard notation, but ok tab is much more suitable for plain 
text workflow anyway)
It’s a package from 1993 and seems that it did lots of non trivial work,
however there’s no license notice and I don’t know if it’s possible to pick up 
the development.

Do you have any idea? Do you find this package anywhere else with some license 
or 
anyone know the author?

Best,
Qiantan