http://www.wowinterface.com/downloads/i ... Wrath.html
Some sounds are harder to find than others. You'll need to search for likely keywords, and paste the scripts into a macro in-game to test if it's the right one. Thaddius is easy enough:
Sound\\Creature\\Thaddius\\Thad_Naxx_Lamnt01.ogg
Sound\\Creature\\Thaddius\\Thad_Naxx_Lamnt02.ogg
Sound\\Creature\\Thaddius\\Thad_Naxx_Lamnt03.ogg
Sound\\Creature\\Thaddius\\Thad_Naxx_Lamnt04.ogg
The sparklepony does not have unique flap sounds, though. You'll just have to search for "flap" and test each one, which could take a while
