LOUISVILLE, Ky. — Don Hustad, a leader in evangelical church music who taught for 40 years at Southern Baptist Theological Seminary in Louisville, Ky., died June 22. He was 94. Hustad, once full-time organist for the Billy Graham Evangelistic Association (BGEA), served on the faculty of Southern Seminary’s School of Church Music from 1966 until his retirement in 1986. He…