Just a random question that popped into my head while crooning in the shower today:
Not that it would be anything but crazy, but do we know enough about the anatomical details of vocal chords to be able to perform some type of corrective/cosmetic surgery that would lead to a better singing voice?
EDIT: Well, I meant a good singer, but god singer fits too.
Given that vocal chord surgery ruined Julie Andrews’ singing voice, and that she has not had surgery done to correct that, I’d say probably not, although the opposite is obviously possible.
Don’t know about good singers but as for god singers, castrati were fairly common in choirs until the 18th century. The last castrato in the Sistine Chapel was Alessandro Moreschi who died in 1922.
And the surgery they underwent was both corrective AND cosmetic.
Ouch, well, that’s one way to get to Carnegie Hall.
I figure I’ll just install a bathroom wherever I need to perform.
LALALALA
lowlowlowlowlow
However, no vocal chords were harmed in the production of this castrati.
It would not be possible for surgery to make you a good singer. It might change the timbre of your voice, but being a good singer is something different. For that, you need (a) an innate ability residing in the brain and (b) lots of training to teach the brain how to use that ability to the maximum.
In any case, vocal cord surgery is more likely to ruin your voice than improve it.
It should also be noted that vocal chords are only one part of the puzzle.
The shape and density of the teeth, jaw and sinuses has an effect as well as the shape of your oropharynx.
Having a good singing voice is a complicated issue and while the generalities may be understood, the precision of knowledge required to actually build a good singing voice doesn’t exist.
As long as you’re not an atheist 
Only if you were already a good singer but have some vocal damage. Good singing is a muscle coordination and strengthening issue. It would be like asking if you could have surgery to make yourself a good basketball player.
Sure, you could maybe change some physical characteristics. There are techniques called vocal feminization that involve ways of shortening and/or thinning the part of the vocal chords that move. But even this usually makes your singing voice worse, not better.
The only vocal surgeries that seem to help are those for damaged vocal chords. If you have vocal nodules (basically callouses), those can be removed. And while it can be done much better than happened with Julie Andrews–since we now know not to remove stuff we don’t think actually helps anything(!)–it’s still somewhat risky and the amount of vocal rest (not talking) and retraining is arduous. To the point that it’s still a last resort.
In theory, you could change the nasal and vocal tracts, or maybe open up some sinuses if yours get blocked, or something. But that still won’t make you a good singer. Nor did castration actually made their voices better–it just kept their voices from changing so they didn’t have to learn new coordinations.
Other cords, not so much.
Is this about gospel songs?
Surgery of any kind is essentially traumatic to the tissues involved, at least to some degree. So I would definitely say no.
A CHORD is a group of musical notes. We have vocal CORDS, we do not have vocal CHORDS. A vocal chord is a physical impossibility, in fact, for a solo singer. If you have a group of singers, then they could sing a vocal chord, that’s what choral music is, but they’d be making it with their vocal CORDS.
Good luck with that. Perhaps you should call them “vocal folds” and then there’s be no misspelling.