From Time Magazine:
AIMEE SEMPLE MACPHERSON The Canadian-born preacher and healer was a proponent of evangelical entertainment, dramatizing her sermons with costumes and band music. After an itinerant but charismatic ministry, she settled in Los Angeles in 1918 and was hugely successful teaching her Foursquare Gospel of Christ as savior, healer, baptizer and coming king. Offerings paid for the $1.5 million, 5,200-seat Temple Angelus and a lavish life-style. In 1926 she plunged into scandal after police said her self-described kidnapping was really a lovers' tryst. She died in 1944 after an accidental overdose of sleeping pills. Her denomination now has almost 3 million members and 24,000 churches and missionsI still don't have a clue about #3, but "Simple Gifts" was a Shaker song. The Quakers believe in silent worship, which would explain why the author would be horrified it's sung in churches.