Clyde Moody told me (many years ago at Berryville) that Monroe would do a new song on the radio Saturday night...and it would be on the Stanley's radio program Mon. morning. Must have steamed him big-time.

I read somewhere that the Louvins used unusual tunings and tuned out of concert pitch specifically to make it difficult for other bands to 'borrow' their arrangements.
I'm not at all knowledgeable in this area - Rick's comment just reminded me.
I must say that although I love 'em all, I prefer the (to me) clarity of the Stanley Brother's sound.