I checked with Bill, and he says so long as you can do Christian Gospel.. Yes, the church DOES pay for Professional groups.
And as he and I were discussion, a song is a song, If you sing in the bluegrass style, no reason it can't be Christian,,, Myself I sing (non pro) in many areas, Sometimes it is Gospel (Though in the classical style, not gospel style) and sometimes it's pagan, And ... Well, a whole lot of other things too. (Science Fiction Flik Rooms). Can get real interesting some times when you have multiple sets of lyrics to say... Lord of the dance.