I see someone is very progressive here! The only thing is, I don't think there is anything in the game restricting you from doing any of these, it just isn't a definite option. Such as setting your sim's sexual orientation: it isn't something you can choose from a list but in the Sims world no one cares! Love is love.
I am definitely a huge supporter in the expansion of our Sims' musical lives. I'd love to see the entire orchestra introduced into the game!
All the woodwinds, brass, the rest of the strings. I think it would add a great depth to the game as well as some new professions. The Sims could even start their instrument practice in elementary school like we all did!