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Please reload this page . modelcontextprotocol / ext-apps Public * Notifications You must be signed in to change notification settings * Fork 379 * Star 2.8k * Code * Issues 124 * Pull requests 83 * Discussions * Actions * Projects * Security and quality 0 * Insights Additional navigation options * Code * Issues * Pull requests * Discussions * Actions * Projects * Security and quality * Insights Files Expand file tree main Breadcrumbs * ext-apps * / examples / sheet-music-server / Copy path Directory actions More options More options Directory actions More options More options Latest commit   History History History main Breadcrumbs * ext-apps * / examples / sheet-music-server / Copy path Top Folders and files Name Name Last commit message Last commit date parent directory .. src src     .gitignore .gitignore     README.md README.md     grid-cell.png grid-cell.png     main.ts main.ts     mcp-app.html mcp-app.html     package.json package.json     screenshot.png screenshot.png     server.ts server.ts     tsconfig.json tsconfig.json     tsconfig.server.json tsconfig.server.json     vite.config.ts vite.config.ts     View all files README.md Outline Example: Sheet Music Server A demo MCP App that renders ABC notation as sheet music with interactive audio playback using the abcjs library. MCP Client Configuration Add to your MCP client configuration (stdio transport): { "mcpServers" : { "sheet-music" : { "command" : " npx " , "args" : [ " -y " , " --silent " , " --registry=https://registry.npmjs.org/ " , " @modelcontextprotocol/server-sheet-music " , " --stdio " ] } } } Local Development To test local modifications, use this configuration (replace ~/code/ext-apps with your clone path): { "mcpServers" : { "sheet-music" : { "command" : " bash " , "args" : [ " -c " , " cd ~/code/ext-apps/examples/sheet-music-server && npm run build >&2 && node dist/index.js --stdio " ] } } } Features * Audio Playback : Built-in audio player with play/pause and loop controls * Sheet Music Rendering : Displays ABC notation as properly formatted sheet music Running * Install dependencies: npm install * Build and start the server: npm run start:http # for Streamable HTTP transport # OR npm run start:stdio # for stdio transport * View using the basic-host example or another MCP Apps-compatible host. Tool Input When calling the play-sheet-music tool, provide ABC notation: { "abcNotation" : "X:1 T:C Major Scale M:4/4 L:1/4 K:C C D E F | G A B c |" } ABC Notation Examples C Major Scale: X:1 T:C Major Scale M:4/4 L:1/4 K:C C D E F | G A B c | Twinkle, Twinkle Little Star: X:1 T:Twinkle, Twinkle Little Star M:4/4 L:1/4 K:C C C G G | A A G2 | F F E E | D D C2 | G G F F | E E D2 | G G F F | E E D2 | C C G G | A A G2 | F F E E | D D C2 | Architecture Server ( server.ts ) Exposes a single play-sheet-music tool that accepts: * abcNotation : ABC notation string to render The tool validates the ABC notation server-side using the abcjs parser and returns any parse errors. The actual rendering happens client-side when the UI receives the tool input. App ( src/mcp-app.ts ) * Receives ABC notation via ontoolinput handler * Uses abcjs for audio playback controls and sheet music rendering (in renderAbc() ) Footer (c) 2026 GitHub, Inc. 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