HEILIGENKREUZ, Austria — Working to reach No. 1 on the charts? Try praying. Johannes Paul Chavanne, a monk at Heiligenkreuz Abbey, said there were concerns about how the CD would be marketed. That's how the monks of Heiligenkreuz Abbey found fame. Their compilation of Gregorian chants, a form of sung prayer, has stormed pop music charts worldwide. The debut CD, "Chant: Music for Paradise," was first released in Europe in May and spent 15 weeks at No. 1 on Britain's classical charts. The album made it to No. 7 on the country's pop charts. It was also the top...