Josiah Winslow’s programming language Bespoke encodes instructions into the lengths of words, producing programs that look like poetry. This one prints the phrase “Hello, World!”:

more peppermint tea?
ah yes, it's not bad
I appreciate peppermint tea
it's a refreshing beverage

but you immediately must try the gingerbread
I had it sometime, forever ago
oh, and it was so good!
made the way a gingerbread must clearly be 
baked

in fact, I've got a suggestion
I may go outside
to Marshal Mellow's Bakery
so we both receive one

Related: In the early 1980s, Frank Hayes was so vexed with the S-100 computer bus that he wrote a sea shanty about it:

(Thanks, Jeremiah.)