To me it'd prolly be someone like Jim O'Rourke - someone who really gets a lot of very disparate aspects of music and production of music
a lot of aspects of music werent really in use until like the last 25 years or so
there's like actual performance of music, how well you play or sing
there's arrangement and music theory, how well you can craft and balance different music frequencies and ideas with the frequencies
there's songwriting and lyricism, like the craft and design of a popular song structure, and the words that may be used to lead the song
and then you have like sound design and engineering of sound, which became a much greater aspect of music once electronic production came into play
im very biased towards appreciating the last one, and Jim O'Rourke is someone who's really able to work with all three of these ideas well