Musical Acheivements on common app?

I have played bass since 4th grade in the school orchestra and became section leader for the past 2 years. Additionally, I have learned 8 instruments outside of school, but have run out of room in the infobox. Should I make a whole new activity for that? It is very important to me. Also, if my orchestra has done very well in competitions, but not me individually, should I mention that?

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