Notation software is precise but slow to edit, and chatbots cannot read a score. Music Block Studio puts both in one place: a real notation editor with an AI agent that has the full context of the score. Ask for a reharmonization, an arrangement or a tab, and the AI proposes changes you review, accept or undo, like code diffs. Import scans, play back and export PDF, MIDI, MusicXML or MP3. Also free in ChatGPT: the Music Block app renders, plays and exports sheet music in the chat.