The most distinctly grammatical error here is in the second line above, which ought to be "She has the way to make me happy." A usual grammatically incorrect substitution for "He has" or "She has", etc., is "He's got" or "She's got", etc., which sometimes get transformed still more by omitting the apostrophe and "s", as in the second line above. But more grammatically confusing in this whole passage is the sudden shift from singing of the title character in the third person in the first two lines above to addressing someone in the second person thereafter. Technically the third line above is ambiguous as to whom he's addressing, because "You" in that line has no antecedent. In the fourth line he calls the addressee by name, so I guess listeners are meant to assume in retrospect that he was already addressing her in the third line. But that is technically ambiguous since immediately before the third line he was referring to her in the third person.

"Sang" is indeed the past tense of "sing", but that doesn't mean that "brang" is the past tense of "bring"