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Many mistakes. My correction is as follows:
Many musician(s) like to play (the) piano. Also(,) the opera(s) of Italy and France (are) very popular too. The (Italian) opera (s)( want) to keep improving their songs, and (have a brilliant orchestra at the same time).In () France, (the opera is more formal/solemn), (based on singing from the beginning to the end). I think the most interesting (aspect) in this chapter is the opera(s) of (the) Romantic period (since) it is very difficult to perform with a lot of (singers) and musician(s).
Remember to use the plural form of the nouns and verbs. Always use " the " when you say " play the piano ". I ' ve rewritten some of your sentences to make them sound more natural.