If you dream that you are composing some kind of music, it means that you are trying to understand your spiritual aspects of the personality. The composing music is also the fact that you are very creative person.
Dream dictionary: Composing dream meanings
To see in your dreams a composing stick, foretells that difficult problems will disclose themselves, and you will be at great trouble to meet them.
To dream of composing a book, loss of time and money. Hearing one being read, idleness.
…poem or listening to one and memorizing its verses in a dream means that one should take heed to what it says. If the poem one is listening to in his dream contains wisdom or a divine revelation, then it does mean good. Composing a poem, or memorizing it in a dream also means losing one’s status, dismissal from one’s job, weakness in one’s religious adherence, suffering from depression, adversities, suffering from slander by one’s enemy, or it could represent a crafty ploy. If one composes a defamatory poem or a satirical poem in a dream, it means that he slanders others for fun or profit. If it is lauding someone, then it means that he will become poor. If he sings his poem with a melody in the dream, it represents a satirical attitude toward someone, doubt about someone, or failure to complete one’s work. (Also see Poet)…