This kind of reminds me of the tones you hear going through Bioshock's menus.

For you guys having trouble loading this, here's my solution.
Go to ~/Library/Application Support/Adium/Sounds and find
Matrix for Adium.soundset
Rename it to Matrix.soundset
It'll work then.
As for the soundset itself, it's just right. Perfect sound length, reminiscent of the Movies, and quite high quality. Sounds professionally done.