% brew install lilypond
% lilypond -fpng -dresolution=300 -dcrop -dno-print-pages input\.ly

# convert to mp3 using wikipedia via mediawiki score extension

% ffmpeg -f lavfi -i color=c=black:s=1280x720 -i input.mp3 -shortest -fflags +shortest output.mp4

I wrote the sheet music for Row, Row, Row Your Boat in LilyPond notation

quarter notes, dotted eighths, sixteenths, beams, halves, and triplets appear.
https://pastebin.com/xEzpkGd5