This is the 10310th most frequent Japanese word.
飛ば
"飛ば" is the stem form of the verb "飛ばす," meaning "to fly," "to send flying," or "to skip."
The word '飛ば' here is part of '飛ばっている', derived from the verb '飛ぶ' which means 'to fly', used in its progressive conjugation.
鳥が空を飛ばっている。
The bird is flying in the sky.
In this sentence, '飛ば' comes from '飛ばす', which means 'to skip' or 'eliminate'. It indicates the action of consciously skipping over something.
彼はそのミスを飛ばした。
He skipped over that mistake.
Here, '飛ば' is part of '飛ばす', metaphorically used to express that the singing voice has overcome one's heart emotionally.