General:
* Gifted
* Skilled
* Proficient
* Adept
* Accomplished
* Virtuoso (for exceptionally talented musicians)
* Musical
* Melodious
Emphasis on natural ability:
* Naturally gifted
* Born with a gift
* Predisposed
* Talented
Emphasis on technical skill:
* Masterful
* Expert
* Virtuosic
* Technical
Emphasis on creativity:
* Creative
* Innovative
* Original
* Inspired
Emphasis on expression:
* Expressive
* Moving
* Emotional
* Powerful
The best word will depend on the specific context and the kind of musical talent you want to highlight.