Take a listen to the singers here. If you like what you hear, PM the person and ask.

We have quite a few folks here who are often willing to participate at no cost on "non-commercial" projects just for the fun.

I've had a number of folks sing with me and I've also sang and played on more than a few other people's projects.

A good way aside from asking through PM is to post the song and ask for help with the BGV or whatever.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.