Create a .LRC file by manually syncronizing the audio with the text
Try it: https://dinoosauro.github.io/music-sync/
When you open the page, you'll be prompted to choose a file. You can choose to read its metadata by using the jsmediatags library, and lyrics will automatically be imported.
Write, paste, or import the lyrics of the current track. You can regulate its speed.
Also, if you have imported metadata, you'll be able to download the album art or all the fetched metadata.
When you're done, click on the "Sync lyrics" button to start syncing them.
You'll find three buttons: the first will mark the current second as the end of the line, the second will mark the current second as the start of the current line and the third one will permit you to export everything.
You can choose between lots of available export options: the first (and most
useful) one is "Export as LRC", but you can also export in a [{seconds}]{text}
format, a JSON file, or only the verse or the synced seconds.
I thought it could be useful as a way to learn more about using Dates. I sometimes buy CDs of my favorite albums, and, while the sound quality is certainly better than Spotify (let's hope Hi-Fi will come soon). However, having synced lyrics is a really great feature, and this might be a way to replicate it.
I'm too lazy to sync all the lyrics of an album, so I won't actually do it – but at least it was a cool project to make.