Well, you could be told by some that it is 'talent based' (I'm talking HSC level music. Professional career. Different story) - But I don't believe it's true. Music is a hard subject, it can be as hard as 4 Unit Maths (Yes, that's like a saying that everyone's probably heard, but I swear- it's true. hehe)
Music can be studied, and studied and practiced and practiced. If you work hard, and really want it, I'm sure you could achive a high level of proficiencey.
Like my cello teacher would ALWAYS say to her students (each and every one of us gets drilled by her gah lol)
A student may not have natural talent may work so hard that they get to this level (Quite high)
A student that does have talent, may reach that same level, without working hard. BUT they will not progress further, unless they actually put the effort in.
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When you hear people saying music the subject, is 'talent based'- you're taking into account that the HSC is marked on a Bell Curve like Dance- The top people in the state, will push the others down.
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Con High is an Audition based entrance.
they're genrally more peformance based- seeing as they have very small year sizes (no more than say 35 in a year group - Years 7 -12) THey have had kids that have gotten into Encore based on composition though!
Con High kids are talented- and it shows through their audition. The con really (performance side of things) judges on 'Potential' to improve.
Alot of the kids have amazing technique, but things are to be said about their 'musical' aspect. Seeing as they've been brought up, learning technique from the age dot, and that's what teachers really focus on, when you're younger.
They may on the other hand, have a LONG way to go, Musically.
Without Musicality in someones playing- they can't be considered a good player.
Whereas, if it was the other way around- They were musical, and yet their technique wasn't up to scratch yet, they'd be considered very good, and probably be around the top percentile.
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If you REALLY want to do Music, I'd do it. I wouldn't worry about trying to get the top mark or what not. I'd go for aiming on what you think your best is. If that's the top mark, well heck- Yay!
but it you really want to do it, because you like it- and you find it fun and everything, don't give it up.