Pagliacci (Players, or Clowns) is an opera consisting of a prologue and two acts written and composed by Ruggero Leoncavallo. It recounts the tragedy of a jealous husband in a commedia dell'arte troupe. (Its name is sometimes incorrectly rendered as I Pagliacci with a definite article.)

Pagliacci premiered at the Teatro Dal Verme in Milan on May 21, 1892, conducted by Arturo Toscanini with Adelina Stehle as Nedda, Fiorello Giraud as Canio, Victor Maurel as Tonio, and Mario Ancona as Silvio.

Since 1893, it has usually been performed in a double bill with Pietro Mascagni's Cavalleria rusticana, a pairing referred to in the operatic world colloquially as "Cav and Pag". It is the only one of Leoncavallo's operas that is still widely staged.

Lexical, of course, refers to words. I think that Amos means that I am an opera about two clowns with words, or perhaps an opera with words about two clowns.

Whatever he means I don't believe I know of an opera WITHOUT words. That would make the libretto difficult indeed.