Dussmann calls itself the Department Store for Culture (KulturKaufhaus) - and rightly so: Not only does it feature a wide range of media products (books, dvds, audio books, etc.), but also an award-winning section for jazz music.
More than that, Dussmann hosts not only readings, but also short jazz concerts every once in a while - usually by artist presenting their new releases. Make sure to keep an eye out!
We don't know about any jam sessions at Kulturkauf