Music written with distinctive shapes for each pitch became a way of training American amateurs to sing harmony in a choir. Fa-so-la plus mi, rather than do-re-mi, for starters. Known as shape-note singing, it led to a distinctive style of hymn performance called Sacred Harp, especially popular in the South. Here’s a bit from the Easter Anthem by colonial New England composer and tanner William Billings. I learned the piece with Mennonites and can attest that shape notes can be so much fun.
Jnana's Red Barn 