#7 is definitely the Clock Tower music from Ys III on the SNES. I just double-checked it.
I'm pretty sure #4 is by Konami, and by the same composer as TMNT on the NES. It's a later-era NES game judging by the use of DMC samples. It sounds like it may be from a sports game rather than an action game.
#2 is really hard to trace, because it sounds a little like an early-era NES game. This'll take a bit of time. (Someone else can search through NSFs.)