Susan,I'm not acquainted with any traditional songs about abortion, but unwanted pregnancy is an all too common theme in folksong. "The Cruel Mother" is a chilly tale of infanticide, and there are countless songs of women abandoned with children, "The Dear Companion" from Cecil Sharp's collection is a favourite of mine, Also in Sharp's collection, "I'm a Day Too Young", "No My Love not I", which includes the deliciously wicked verse..
The best thing I can advise for you to do, Is to take your baby on your back and a begging for to go, And when that you are weary love, you may sit down and cry and curse the very hour that you said, not I my love, not I. 'The Cruel Ship's Carpenter" tells of a fellow who leads a girl astray, then knifes the poor wretch.In American folksongs that came over from Britain, references to pregnancy are often deleted ( damn puritans!) but if a young man is inexplicably killing his darlin'....
It ain't folksong, but the Sex Pistols did an incredible song about abortion, I don't remember the title, but it's on their album "Never mind the bollocks". I never could make out all the lyrics, noisy stuff, but I recall lines like..
In a plastic packet in a lavatory,
illegitimate place to be,
Bloody little baby, screaming, mummy, I'm not an animal, it's an abortion. Also..
She don't want a baby that looks like that.
Good uh, hunting??? Frank.