Peter Morrell writes:
“In summary, from this we can see that any planets in Leo and Aquarius tend to be linked with musical ability, especially the middle and end degrees. We can also see 13-19 degrees of any sign can confer musical ability especially those in cardinal and fixed signs, but even in mutables too. 29 Sag also seems prominent in many charts.
Musicians and composers need a sense of vibration [16 fixed signs] a sense of rhythm [Jupiter or Mars in earth?] and also a sense of subtle perception [Venus Neptune contacts]. They also need artistic sense [Venus] and the sense of symmetry [Libra] and architecture [Mercury Saturn] for composition. Many also deal with lyrics and thus a Gemini, Virgo, Mercury component also comes in.”
He has an impressive list of the birth dates of of various musicians and composers – Check it out