sandeep11mahendrakar/music-player ? reverse-engineered prompt

Build me a full screen music player web app with a really flashy theme based look, like the Instagram style music player trend.

I want four different visual themes, and each theme should load its own YouTube playlist, artwork, and matching colors. The player should feel synchronized, with a hero style center screen, music controls near the bottom, lyrics shown when available, and live playback info that updates in real time. Please make it use a Node and React app with a backend that can stream audio from YouTube instead of downloading files permanently. If lyrics are not available, just show that cleanly without breaking anything.

Also keep MongoDB support for saving playlists, songs, favorites, history, preferences, and other metadata. I want Socket io for live updates like playlist changes or listener counts. Make it look polished and demo ready, and keep the existing local audio option too. If you need to check current docs for anything, look them up online first.