What is the fine-grained topic of the following text: On June 1, 1998, Dr. Butler retired from his duties as Director of Choral Activities and Music Theory at Johnson County Community College in Overland Park, Kansas; the conductor of the Johnson County Choirs (a fine civic choral group that sings throughout the Kansas City area) and as the director of Music and the Arts at Valley View United Methodist Church in Overland Park. Only return the topic.
Dr. Butler's retirement from his various musical roles in Overland Park, Kansas.