An excerpt of a chromatic passage from Franz Liszt’s “Hungarian Rhapsody 2” is used to illustrate various alternative notation systems in this tutorial on the main Music Notation Project site. Written in a key signature of six sharps, and having to use numerous accidental signs, it illustrates some of the difficulties and complications inherent in traditional music notation that are overcome by alternative notation systems.
Here is an illustration of a short excerpt from it in Hamburg Music Notation: