Dark Orange = Worst song on the countdown/Hitbound (so awful it's not even funny)
Light Orange = One of the bottom 3 worst on the countdown/Hitbound (reserved for really really garbage weeks when there's just so many songs that could be considered the worst)
Red = Terrible (really bad, containing very few if any qualities to it that work well)
Light Blue = Bad (fairly bad but at least a bit tolerable, mostly bad but with some redeemable qualities, or bad but in a way that's funny so I actually listen to it sometimes)
Yellow = Mediocre (still not very good but I can think of multiple qualities that keep it from being worse)
Pink = Decent (equal parts good and bad, or good but forgettable and not the type of song that I would ever think to listen to on my own)
Dark Blue = Good (song that I like but could have been improved in one or more areas)
Green = Great (a song that I would definitely listen to again, strongly created, and very few if any qualities to it that are weaker)
Light Purple = One of the top 3 best on the countdown/Hitbound (incredible song that is one of my personal favorites)
Dark Purple = Best song on the countdown/Hitbound (so amazing it should be illegal)
