Beethoven's chamber music

It might be time for a thread on classical music books. I'm not so interested in autobiographies, more in analyses of works. And done linearly, i.e. work by work. I've never been sure what the target audience is for works that look at aspects of a composer's technique across all his, or her, works. Unless you already know those works very well it's often difficult to pick out exactly where the musical examples come from and their context in an overall structure.

Thanks to all for the recommendations above for the Beethoven Quartets. I also want to dig deeper into Brahms' chamber music. The liner notes with my recordings of the Viola Sonatas, Piano Trios and Piano Quartets are minimal.