This is my first visit and I'm really enjoying reading the discussions. Please excuse me if these have already been suggested and I missed it:

1)"Ba-ba and a lily-ba"

Maybe it's (meaningless here, but) transferred over from something like Ewan MacColl's version of The Elfin Knight, "blaw, blaw, blaw winds blaw" ?

2)"Oh (ought oh ought)?? would give to me rest
And* that young knight lay here on my breast."

Possibly "aught" ("anything") ?