Check Song Lyrics

I’ll try to explain max correct what I want for this project. I have 15 song lyrics created for the metal band I produce. The original text writer made excellent work creating these lyrics but there are BIG problem… The writer was not native English speaker and in the texts there are grammatical errors. I do not want my boys to sing stupidities. That is unacceptable! So…I am looking for person (native English speaker) only to correct the lyrics where there are errors. Maybe in some texts there are not errors…Maybe in the other there are more… Not write anything!! Just correct existing texts. Sound easy but there is one thin moment here. The music is already made (unfortunately). So that the syllables have to stay unchanged. Example: Wrong: “My is name” ---- 3 syllables Correct: “My name is” ---- 3 syllables Did you catch it? When I provide you the texts I’ll mark the beginning and the end of each music phrase and the syllables. After your changes the syllables in this phrase have to be the same. I have REALLY good budget for this project and I’ll send you 1,5 x (your bid) as bonus if you make your job qualitative. The perfect situation for me will be if the writer is heavy metal fan – with good knowledge of the specific in the text creation for this music style. In additional - Some texts have a religious directivity. Please don’t bid if this offense you. The way I’ll work is as follow: I’ll hire 2 native English speakers. The first will correct the lyrics. The second one will recheck the work of the first. I’ll pay the money + bonus ONLY if the second person told me that all is correct. I’ll send brief example to all persons who are interested and the all texts after I choose one because the lyrics have to be confidential. This project is really important for me so please ONLY serious bids. Please type your favorite color in the bid to be sure you're real person. Thanks for time reading this. And repeat PLEASE ONLY NATIVE ENGLISH SPEAKERS!!