tclabc is designed to help on writing music in ABC notation, especially on
Unix systems. It requires Tcl/Tk (8.2 or newer), and a C compiler.

It contains two main parts:

- a Tcl extension, written in C, which translates ABC to/from TCL
variables, and helps for tune navigation/modification.

- a Tk graphical interface which permits creation or modification of
tunes, using the previous extension.