Allen was one of the first evangelist to originate a national television ministry, broadcasting prophecies, unverified healings, and "claimed to communicate with the demon world" over the airwaves. He died from causes related to alcoholism. There is more interesting reading on Allen's wikipedia page.
Allen knew how to entice folks to buy records. Albums were frequently pressed on color vinyl, Titles could be lurid and and cover images, garish. Copy was also tended to be sensational. Overall Allen covers feature strong graphic appeal.
The music could also be great fun and full of energy.