I learned solfège as a kid long ago, and have been playing ever since without interruption, but I seem to have forgotten quite a few things that I haven't really needed all those years, and might not be aware of many other interesting things since I haven't studied at the conservatory.
Is there any comprehensive book on music theory that you could recommend? (References in French are fine too.) I would be mostly interested in modes, scales, "musical patterns" and the relations between them, as well as their uses in various kinds of music. Please recommend only books you've had experience with, and explain how they cover the topics I mention.