Do volunteer work now and find somewhere to do something really valuable junior year (senior year is really mostly waiting to hear back from your dream schools and even match schools). It is possible to really make a big contribution, lots of needy people and causes, and if you are creative, a natural leader, and hardworking, it could happen that you do something that will wow even Yale.
Piano and music accomplishments and talents would need national level recognition to be more than a checkmark that would mean you are one of say 20,000 qualified applicants out of those 27,000 of which 2,000 will be chosen (GPAs weighted to 4.5, dozen AP tests, SATs or ACTs very high likewise will not get you out of the big pile).
Tour schools and find schools that you like almost as much as Yale, or maybe even better. Yale admission is frankly rare for even the most gifted students (the one in 10 high school number above is correct even in a top school district in the US). Is your high school nationally ranked? If not, it is less likely. Again, unless you reach some national level at something … again not likely.
Middle school 4.0 means you have the talent to get a 4.0 in high school, so go there and work hard and make sure you do. Push yourself academically, take hard courses, do research, whatever.
Frankly, getting into Yale is much, much harder than it was 10,20,30 years ago, so if there is family pressure or your own pressure to be the best, be aware that there are many other best (and I mean truly spectacular) students who are not getting into Yale but will likely be wild successes in life. Find your opportunity at Yale or elsewhere and be who you want to be at 35 or even 50.