In practical English, it is very common to use the word remedy for a good medicine.

However, it is usually explained, such as "in trouble" or "in life", etc.

Just say: Music is a great remedy. It seems very abrupt. Even if it is used in this way, it must be accompanied by the article "a"

For a more complete expression, you can say:

Music is a great remedy in life.

When dealing with a difficult time, music can be a great remedy.

Music is a great remedy for us to turn to in times of trouble.

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