The Alto Wore Tweed (Liturgical Mysteries #1) by Mark Schweizer (St. James Music Press, 2002)
This book is just for fun. If there is something of redeeming social value about it, I didn't notice, but I laughed longer and harder than I have over a book in a long time. Our choir director introduced me to the series—we get some of our anthems from St. James Press—and it was also recommended by other choir members.
The protagonist is an Episcopal church music director who is also a detective and a writer of "hard-boiled" detective fiction. I'm not a fan of that school of detective stories, but I know enough about it to get some of the jokes. And as a member of an Episcopal church choir, I can tell you that the author hits just close enough to the truth to be really funny. What someone without this background would think, I don't know.
I was warned that I'd have to not mind the "religious irreverence," but it's not irreverent toward God, and a bit of irreverence toward choir and church foibles is probably not a bad thing. Some of the situations and humor are "adult" (though I hate to use that term) but not graphic. I have a very low tolerance for such things and still enjoyed the book a lot, so I doubt anyone else would have a problem; I mention it merely as a grandchild warning to parents. More to the point, I don't think any of our grandchildren have enough experience as yet to appreciate the satire.