Comment by mushishi

Lyyri, in which you can split a Youtube video into parts and add lyrics to it: https://egaga.github.io/Lyyri/

Mainly made for myself, so that I can easily sing only parts of the song with lyrics.

Then Spotify added lyrics back and kinda lost interest in this, even though could be used for other purposes as well like teaching purposes: giving link to students to watch only some of the video with added commentary by teacher. Though, currently the actual video is shown only really small so doesn't suite for that.