I got some MIDIs and a few WAV files so hopefully you can find something cool. I'll try to get some more later but until then, you'll just have to make due.
MIDI Files
about_a_girl
all_apologies
all_apologies(different_version)
blew
come_as_you_are
heart_shaped_box
heart_shaped_box(another_version_of_it)
lake_of_fire
lithium
pencap
penny_royal_tea
territorial_pissings
polly
sifting
sliver
the_man_who_sold_the_world
(I'm not sure what this
and this is so if you hear em and recognize em, could ya tell me?
Verse-Chorus-Verse
WAV Files
Aneurysm
Dive
Molly's Lips
Polly
Scentless Apprentice
Sliver
Son of a Gun
Stain