"and Lady Mondegreen"

I have the old song Furusato on my play list. I kept hearing the first line as 'the rabbits are delicious'- usagi oishi. Ah that old hometown cookin'. Yes, OK. Hurray for archaic endings (should have known from the wasure gataki instead of wasuregatai.) 'usagi oi 追い shi し kano yama'- to wit, those hills where I once chased after rabbits. (Yeah, 追い is a long o and oishi is short, but songs do occasionally hold vowel sounds to match the notes.) Good. *That's* cleared up at least.
( The whole thing, for reference )