So if you’re learning to play Bach’s first Praelidium, you can get that in shape note? Or is it no longer necessary at that point?
Praeludium
Actually, I've never seen shape notes used for anythng but a partcular genre of music, namely what's known to some as "white spirituals" -- 18th and 19th century Christian congregational hymnody.
For your Bach, you probably need them ol' round notes after all... :o)