The Mine Song but almost every word has been replaced and the desciption exists

What's going on here: every singular noun has been replaced with mailbox, every plural noun has been replaced with feelings, every determiner has been replaced with that, every verb (not including is and are) has been replaced with caress, every pronoun has been replaced with mine, every is has been replaced with are, every contraction has been replaced with it's, every conjunction has been replaced with and, every preposition has been replaced with of, every possessive noun or propernoun has been replaced with birdie's, every adverb is replaced with emphatically, every adjective has been replaced with instrumental, every sound that stingy makes, the drum at the end, and flag sound have been replaced with Stingy's humph, source words have not been changed, all directions are west, source words are not changed, and the only type of word not changed is proper noun which only occurs once (Stingy, not including ziggy's which is a possessive proper noun) join the meme brigade:   / discord