Did you know you can build a digital audio workstation inside a Jupyter notebook? In this talk, we'll use nbplay, an experimental notebook-based DAW, to explore Jupyter as a platform for mixed programmable and interactive computing. We'll make music with synthesizers, samplers, sequencers, mixers, and transport controls, but the real subject is bigger: what becomes possible when code cells, rich browser UI, kernel state, and live interaction all share the same workspace.