Please rephrase - the question is unclear.
Music is a part of Opera. Opera is a stage play in which all the dialogue is sung with musical accompaniment. The difference is that opera needs music but music doesn't need opera.
The musical can be looked upon as a further evolution of opera, operetta etc. Opera [Opera = work]. Opera is a drama to be sung with instrumental accompaniment usually with scenery and in costume. It may include recitative or spoken dialogue, but the essence of opera is that the music is integral and is not incidental as in a 'musical' or play with music. Musical [theatre] is a form of theatre combining music, songs, spoken dialogue. Usually the play [musical] is broken-up by songs or such like. So basically 'opera' is music drama and 'musical' is a play [drama] with music interludes. But like all thing to do with music there are variants.
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The second one. Traditionally, operas have little or no spoken dialogue at all - as opposed to musicals, which have songs to illustrate major sequences and dialogue in between. (Thus Lloyd Webber's "Phantom", insofar as the film, is NOT actually a traditional opera, nor is the stage show; it is technically a musical.)
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Ballet is dancing; opera is singing. Although there are operas that include ballet, no ballets that include operas can be found.
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The second one. Traditionally, operas have little or no spoken dialogue at all - as opposed to musicals, which have songs to illustrate major sequences and dialogue in between. (Thus Lloyd Webber's "Phantom", insofar as the film, is NOT actually a traditional opera, nor is the stage show; it is technically a musical.)
We all like musical sounds and we hate static annoying noise.
Richard Wagner
Opera "comique" has spoken lines, not just singing.Second Answer:The only practical difference is that comic opera is usually funny and ends happily. Some operas have spoken dialogue, but it doesn't necessarily make them comic operas. Bizet's opera Carmen was written with spoken dialogue between the musical numbers and was premiered at the Opera Comique in Paris, but it is definitely not a comic opera. In the early 18th century, Italian composers sometimes gave female lead roles in serious operas to sopranos and in comic operas to mezzo-sopranos, but that wasn't universal either.