Conrad Fisher's musical journey has taken him from an Amish country upbringing in Pennsylvania to Nashville and back. These days the singer-songwriter has been making videos and recordings of musicians with Amish and Mennonite roots — building audiences well beyond the conservative religious communities.

Last weekend Fisher took the stage in a former Presbyterian church that he bought for a song and converted into a performance space and recording studio he calls Ragamuffin Hall, in the rural Pennsylvania community of McCoysville.

Fisher performed two sold-out concerts with Ben and Rose Stoltzfus, a married couple whose Amish background and church choir harmonies have drawn millions of YouTube clicks. It was a sort of warmup for shows they're playing together in the coming months at much larger theaters in Pennsylvania and Indiana.

“Ragamuffin Hall,” Fisher said, "is supposed to be a place where those weird things that'll get you ostracized everywhere else, we're like, 'Oh, no, that's a gift.…