Talent is an inborn ability or aptitude to interpret music and technique, whereas intelligence is the power of knowing and understanding through experience and application of the musician. Indeed, so if a musician is born with talent, it won't manifest until he is older in order to comprehend the notes and the mechianics in learning the score in front of him. There are many of us that struggle to perfect our technique and interpretation in learning a piece which requires several hours or several years to attain that goal to a satisfactory level. And that depends upon the musician. Others may dictate what he needs to learn through method, theory and so forth, but the ability to understand is up to him. There are those that music is inborn, that it is a natural phenomenon, like Bach, Mozart and Beethoven. They had the intelligence to perform and comprehend the music they learned, plus they learned to compose at an early age in their lives.
What about being gifted; those that are endowed with unusual talent? They are the ones that music comes easier than to those that has to work in becoming a virtuoso. Some of my piano students show a natural ability to understand what I instruct them, and I feel they are intelligent and when they play, the notes come out naturally-----the music comes from within. Now, I don't know how or why some of my students seem to stand out in their playing, but I do know that the more they practice and become more skilled in technique, and etc, would they realize the potential as a fine musician into adulthood? Not everyone is endowed with talent though. It has to be nurtured. And hopefully, the intelligence will recongnize that this "this is what I can do."
To me intelligence is needed in order to achieve a talent. I don't feel talent handed to someone that never worked on a skill to play any instrument. Some have the ability to learn several instruments with no problem. I learned to play the violin 8 years ago----never before in my life touched a violin, but when I first held it and learned to play through a good instructor, I was able to play at a more rapid rate because of my "musical background" of playing piano, vocal and guitar. As michel dvorsky indicated in his thread: musicianship also comes from experience, musical culture and personality.
best wishes,
go12_3