Please identify and mark words in the following sentence that are related to music by returning the original sentence, but return a comma-separated list of words that relate to music. For example, if the sentence were 'I played with my dog and watched a rabbit perform a symphony' you might return 'watched, perform, symphony'. Return no other surrounding content such as quotes, just a single comma-separated list of words. Your words should just be single words. Here is your input sentence: '{I watched a ballet with music by NAME_1}'" Your entire response should be in English, and in all capital letters.
user