Welcome, T-ROD23. For future reference, there's a board for Requests, but for now, I'll provide you with what I can.
Thread 47866 Here's a link to the thread with the DK64 OST. The *complete* OST consists of 5 or 6 discs worth of music. I downloaded the USF file, and converted the tracks to .wavs, then converted them to .mp3s. The above link is good for about 70 or so songs; everthing else is variations of main themes.
As for Aidyn Chronicles: The First Mage, I have never seen any game rip of the music. I own most of the N64 OSTs and Gamerips available on the internet and through purchase, and I don't recall ever having come across that. Hope the DK64 stuff is helpful!