I've never identified a strong correlation between my music playing and coding, but I've learned guitar, bass, saxophone, sousaphone, trumpet, piano, ukelele and drums over the years, and I know enough about violin, cello, upright bass and flute to not sound like a complete tool.<p>I guess I'd equate that to the ability to write in specific languages (PHP, Python, ASP, Javascript, C) and the ability to read other languages (Perl, Ruby).<p>I've no doubt that being able to effectively and efficiently learn at one (coding or playing) is incredibly helpful when learning the other one.