Mozart's Don Giovanni One of the most interesting challenges in operatic composition , is composing for all the specific characters. A composer has to distinguish between characters through his music. Jan can’t sound like Fran , and Dan can’t sound like Stan. Each character must have his or her own traits. Mozart’s opera , Don Giovanni , provides us with many different characters to compare and contrast. One scene in particular lends itself to the comparison of Don Giovanni , Leporello ,