Oh, harro! >,<
Majora's Mask sounds are pretty hard to rip. I've only found one place (and time) in the game with no music or background noise, and it still has a very slight echo. But you can notice that echo more in the instrument sounds like the Zora Guitar ones posted, and it's even worse in the Deku ones, that's why they aren't posted yet.
And monster sounds are harder because I need to do a whole bunch of GameShark hecking to get them to appear in that area... and I lost the guide to doing that.
But if you want to make a list of your requests, I could try to get some of them.