Who's line is it, anyway?
"Lines" refer to each of the rows of words in the lyrics.
"Welcome to this song" is the first line.
There are 30 lines in total.
Just to be clear, there are 3 columns of rows.
(rows don't continue from one column to the other)
If there's any remaining doubt about what constitutes a line, I'm
sorry; I tried. Hopefully your web browser didn't mess with the
formatting in a way I haven't forseen...