Don Carlos
Don Carlos was an opera composed by Giuseppe Verdi in the 19th century.

In 2375, The Doctor wanted to rehearse a duet from Don Carlos on the holodeck, but it was still occupied by Tom Paris running his Captain Proton holoprogram. ()

The Doctor performed a duet from the opera, "Dio, che nell'alma infondere", aboard the  for an audience of Voyager crewmembers and a number of fascinated Qomar in 2376. He later gave small holograms of him singing the same song to Qomar admirers, even singing a duet with his small holographic self. ()

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Earth musical compositions