Alan Hovhaness is an American composer who produces "spiritual" sorts of works usually with an Oriental or Middle Eastern flavor. His works tend to be either extremely brilliant or extremely bland. He's become trendy in recent years.
This is not your typical symphony, its 24 short movements with a Middle Eastern sound, spiritual, engaging and very dynamic. One of the best. Artik is also wonderful.
Both these are spiritual symphonies however in Mt. St. Helen's the mountain explodes, but this is still done as a celebration of life, not death.