I want a Karaoke Party but it's too clumsy to use plain Youtube Playlists.
I want people to start using it from their phones without asking me to add songs or add them to the playlist.
I want people to commit to the song they've put on the playlist.
I want to tip people based on their performance.

A Karaoke Engine is composed of 3 parts. The Player will be running on a browser on a computer or Smart TV; A WebApp that allows people to choose a nickname, select a song from YouTube, and pay the invoice to add it to the playlist. The user also has to provide either a LnUrl or a Lightning Address to receive their tips; The server will keep track of the playlist and players, as well as generate the invoices for song addition and intercept the invoices from tips, so it can be shown on the screen every time someone tips them.
Paying to add a song makes people commit to their choices, after all, they paid some satoshis to have it there.
Receiving tips can improve the experience, who doesn't want to Sing4Sats?

http://sing4sats.online/

All of it!