Mathematics understood through poems? Along with Diophantus mathematics has been represented in form of poems often times. Bhaskara II composes in Lilavati:
Whilst making love a necklace broke.
A row of pearls mislaid.
One sixth fell to the floor.
One fifth upon the bed.
The young woman saved one third of them.
One tenth were caught by her lover.
If six pearls remained upon the string
How many pearls were there altogether?
Or to cite from modern examples: Poetry inspired by mathematics which includes Tom Apostol's Where are the zeros of Zeta of s? to be sung to to the tune of "Sweet Betsy from Pike". Or Tom Lehrer's derivative poem here.
Thus my motivation is to compile here a collection of poems that explain relatively obscure concepts. Rap culture welcome but only if it includes homological algebra or similar theory. (Please let us not degenerate it to memes...). Let us restrict it to only one poem by answer so as to others can vote on the richness of the concept.

Tom Lehrer, who studied and taught mathematics before becoming a singer-songwriter, wrote quite a number of songs about mathematics, many of which you can find on YouTube, such as Lobachevsky, New Math and There is a Delta for Every Epsilon.
The Klein Four also wrote a number of math songs, such as Finite Simple Group (of order two) and Three-Body Problem, which are more in keeping with the romantic touch of your example. Their web site seems to be somewhat dysfunctional and/or out of date; it purports to contain the lyrics for their songs but I wasn't able to access them; you'll find many of them on YouTube though.
