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(Jen)
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Piano`s C (no sharps) is clarinet`s key of D (2 sharps) 
D(two)=E (four sharps) 
F(1 flat)=G(1 sharp), etc. So, add two sharps to the piano`s key basically in this order: F, C, G, D, A, E, B 
Once key signiture is figured out, you play the written piano notes one note higher, playing based on the new key you just figured out.  Hope this helps. 
 
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