Good assessment, Autephex. Mannaja’s theme song is so novel that it’s initially hard to classify based on what most are accustomed to hearing. The Good, Bad, and The Ugly theme has similar innovative peculiarity that’s widely appreciated yet too unique to spawn definitive equivalents.
Guido & Maurizio De Angelis’ Goodbye My Friend was my first exposure to their music and has a similar feel. I visualized a broken-down, drunken lounge singer crooning(or slurring) barely understandable broken-English to the point that it felt like an offbeat novelty song. At the same time I thought it was great and one of the elements I most associated with and remember from Street Law.
I like that music video you posted.