To dream of musical notes represents feelings about yourself noticing exactly how something feels.
You may be having a moderate experience that gives you insight into how it feels to experience something in it's entirety. Alternatively, you may be experiencing a situation that someone has already experienced and becoming aware of the details or subtleties of the experience.
Negatively, dreaming of musical notes may reflect feelings about yourself being a loser that has to experience pain or bad luck that you were aware of other people experiencing before you.
Example: A woman had waking visions of seeing musical notes. In waking life she had glaucoma in only a section of her eyes and was blind only in that section. The symbolism may have reflected her awareness of herself "noticing how it feels" to be blind while she mentally prepared to become fully blind soon.
*Please See Sheet Music