TypeScript music theory engine ships with MCP server for AI tool integration

codewithbre released @playbykey/theory, a TypeScript library that handles music theory logic — scales, chords, intervals, and the like — alongside an MCP server so AI assistants can query it directly. For developers building music apps or AI-powered composition tools, having a dedicated engine rather than rolling their own theory logic is a meaningful time-saver. The MCP angle is the sharper hook: it positions the library as a first-class tool in the emerging AI assistant ecosystem rather than just another utility package.