Most ASCII-converters work with blocks, but this one focuses on lines and structures. It was made by Xuemiao Xu, Linling Zhang and Tien-Tsin Wong in 2010. The comparison at the end is between an artist’s work (a) and their software (b). More info and images here.
A tool to draw ANSI through music, in realtime. ANSI MIDIo visualizer
is small piece of hardware by Will Lindsay (aka VBLANK) that converts notes to text characters, and velocity to colours.