LOL
If the singer can't sing with a karaoke type of set up, there is no way they are going to stay in time with you using your keyboard with styles.
It threw me when I first got the keyboard on a few songs. I was used to jumping back in a half measure early on a couple songs.
Just this week at a gig one woman was kidding with me as I was setting up and ask me what kind of music do you play? I laughed and several other folks did as well as I simply pointed the sign hanging beneath my keyboard. It reads in big letters
"If it isn't COUNTRY, it ain't MUSIC". She laughed and then ask, do you do any gospel songs? I replied, "Do see 3 more guys standing around?". Again everyone had a chuckle, including her.
Oh, but WAIT I said. I do have ONE song, but you have to sing one line for me in the song. YOU will know the one line and when YOUR line comes, YOU have to sing it. She said okay.
So, I started the gig with the song "Daddy Sang Bass". Of course her one line was
"Momma sang tenor" and she knew it BUT came in really late every time. It totally threw me and the style off, I just held the Fill in button to reset so I knew where to jump in to continue each time. I simply looked at her at the end of the song and said, "We need just a bit more practice, I think." Everyone had a laugh.