Etc.
"I have a good practice tip relating something more likely to come up when captioning/subtitling music.
If a lyric is repeated, when you sync your subtitles try to create a gap between end of first lyric, and start of second repeated lyric.
This ensure that there is a 'blink' on and off visually between each lines and indicates to the viewer that the lyric is sung twice -
Obviously sync this to the audio in the same way you would any subtitle.
If you don't put a gap in there is no visual clue that this line is sung more than once and your subtitles will end up looking like one line and one lyric no matter how many times you type it. Hope that makes sense."