I have noticed something that is rather odd but it has fixed a problem I have had with Canola many times so I will post and maybe it will help.

I see many people have trouble with AAC when I do a search for media Canola doesn't find the files but for some reason If I set the video folder to the location of the AAC files and refresh it then finds all of my AAC Music files even when there is no video files it picks up all of the music.

I have done this several times and it fixed my problem maybe the developers can make some sense out of it.