Thanks. Come to think of it I often replaced songs instead of delete then add. Well, I guess I'll reassemble my song collection; sigh.

Thanks man! No more sound oddities...yet. Anyway, out of curiousity, does the size of the strm folder matter into this though? I deleted ALOT of songs trying to remedy this and I'm starting to think it was for nothing lol.

Let me explain it: Sometimes a certain song in certain level will play like normal but halfway it does a small static like noise and it switches to an unrelated song (brstm or not) and it either sounds muffled, at a different speed and pitch, or it straight out plays nothing but static until it goes back to the actual song only to repeat the same process. I've already tried using different brstms but I get different results and since it doesn't just happen with just one file, it's hard to keep track of what the problem is. Here's the info on my setup so you might see what I can't in plain sight:
My strm folder is at 812mb
I'm using a 2gb sd card and 1.63 gb of it has been used.
I'm using the classic stage expansion for project m 3.02 (full set, hackless launcher)
I notice that this  tends to happen the longer I have a set of hacks without restarting from scratch which I do every once in a while, so maybe my memory is too full and it's causing problems? If that's true I just want confirmation since I've googled everywhere for an answer to this problem and I just want to be pointed in the right direction.