The operatic life of legendary tenor Luciano Pavarotti is on full display in producer/ director Ron Howard’s documentary “Pavarotti” (screens Tuesday in 600 theaters via Fathom Events; opens Friday in select cities, including New York, Los Angeles and Chicago; expands throughout summer).

But nowhere is the drama more fairy-tale-like than the enchanting scenes from the 1991 “Pavarotti in the Park" concert, when the Italian opera star serenaded a rain-drenched Princess Diana in front of 125,000 fans (and Prince Charles) during a downpour in London’s Hyde Park. It was a romantic high-water mark for the most famous singer in the world and “The People’s Princess,” and the beginning of an enduring friendship.