Possible Clues:

• Riders
• Apocalyptic 4 (not 6) seem misplaced in cape
• Guys riding steeds
• Sermon he broadcast about Biblical quartet
• The Bible has Four . . . . . . . . of the Apocalypse
• Those up and off seem restrained by instrument
• Noted foursome
• Trainers, jockeys et al.
• Revelation quartet
• Jockeys