I was thinking of doing something akin to the NinDB Top 25 without actually showcasing 25 favourite games (because it's not like our opinions are going to change annually). This long video is the result. (See YouTube comments for quick seeking)
I picked my 3 favourite songs per system (without picking the same game twice), and added a few other songs that I like but didn't quite make it. This list can actually go on and on, but I wanted to keep the scope clear.
At first, I was going for top 4 or 5 per system, but I couldn't think of anything good enough for NES and N64 (at least with Nintendo-published games), and the honourable mentions was how I worked around that. On the other hand, I can probably dedicate a section for Dreamcast, but that would look weird in this otherwise Nintendo-centric video.