Here's some links for you. One is the AFC files from Twilight Princess (you'll need in_cube to play these), the other is for some MP3s.

Gamecube audio:
http://www.hcs64.com/files/The Legend of Zelda Twilight Princess (AFC,THP)/TPStream.7z
(copy the link...)

MP3s:
(This is the above files converted to MP3)
http://www.sendspace.com/file/nple23
http://www.sendspace.com/file/agtbb2
http://www.sendspace.com/file/xi0fo2

(Sampler disc)
http://www.thehylia.com/media/thumbnails.php?album=280

(Hour+ of rips/recordings.  This may contain some, or all, of the links below.  I haven't downloaded this yet.)
http://www.sendspace.com/file/84cyzy

(In-game music rips. Some of these are available from the GC ISO rip, most notably the credits.)
http://4x86.com/twi/fairy_fountain.mp3
http://4x86.com/twi/midnas_true_form.mp3
http://4x86.com/twi/goodbye_midna.mp3
http://4x86.com/twi/credits_1.mp3
http://4x86.com/twi/credits_2.mp3
http://4x86.com/twi/credits_3.mp3
http://4x86.com/twi/choose_a_quest_log.mp3
http://4x86.com/twi/hyrule_field_at_night.mp3
http://4x86.com/twi/hyrule_castle.mp3
http://4x86.com/twi/hyrule_castle_2.mp3
http://4x86.com/twi/ganons_theme.mp3
http://4x86.com/twi/ganons_puppet_zelda.mp3
http://4x86.com/twi/dark_beast_ganon.mp3
http://4x86.com/twi/dark_lord_ganon.mp3

(More in-game rips. Different person.)
http://host.kg13.com/music/Legend of Zelda Twilight Princess (Wii) Game Rip/
(copy the link)

(Shop Theme)
http://www.sendspace.com/file/puraan
(Demo movie that plays at TP's intro)
http://www.sendspace.com/file/vnvw3l

http://www.sendspace.com/file/jghtua - Gerudo Desert
http://www.sendspace.com/file/tb1437 - Arbiter's Grounds

(western-ish song from the Shieka Village)
http://www.sendspace.com/file/0db9wg