Here's one that probably nobody remembers: "Unborn Child" by Seals & Crofts (two country boys at heart) from about 1974:
"Unborn child,
if you only knew
what your mother's planning to do to you"
...or something along those lines. I think it actually made the Hot 100, but certainly not the top 40. Imagine a song like that - today - getting any air play whatsoever: the feminazis would shut down the station!
I almost forgot, The Galactic Cowboys have one of the most ferocious pro-life songs ever "If I Were a Killer (I'd Hide Behind a Doctor's Door)." Fantastic song with an inescapable message. BTW, it ROCKS.