Encore-Karaoke-Labs/Encore-Karaoke ? reverse-engineered prompt

Build me a desktop karaoke app for Windows and Linux that turns my PC into a karaoke box for local songs and YouTube search.

I want it to scan a local folder called EncoreLibrary, show my songs in a simple menu, and let me play them with keyboard controls or my phone as a remote through a QR code in the browser. It should support normal audio files with lyrics, video karaoke files, and MIDI karaoke with soundfont playback. Please include real time microphone scoring, pitch tracking, key and tempo changes, mic and music volume controls, and an option to record my performance to my hard drive.

Also add a room mode so friends can join, queue songs, chat, and cheer from their phones, plus a leaderboard. Keep the look like a fun living room karaoke machine, full screen friendly, and make setup easy with a settings screen for mic, speakers, latency, and library path. If you need current docs for anything, look them up online first.