I've been trying to add my own music into the the proper playlist via the creation kit , however even though i've converted to a wav , created the new track and added proper conditions matching the other songs [ example the time for morning etc. ], and added it into its proper type, the Music doesn't play in-game. also when reopening my mod i notice that inside the music track edit window " Choose File" is empty even though i picked the proper wav file and saved it before, and trying ot save afterwards crashes the creation kit.

Yeah, there seems to be some sort of bug with music tracks. See http://www.gamesas.com/topic/1344661-adding-new-music-through-ck/.

Thanks for the link, hopefully this problem is resolved soon.