Here is a reference I used for my Biology class some years back, in case you need it. And, as always, I add a new piece of music, which, in this case, is completely unrelated. Enjoy!
The first composition, below, Theme 52, is probably the first “song” I ever wrote, assisted by Bruce Markkula, when I was about 18 years old. A guitar duet, I recreated it with garage band pianos. The second is Theme 74, which I call “Turn Around” because the tiny first line, which recurs, sounds like that.
A Morality Tale in Pentametric Couplets