Beginner Question on Music Theory

[vincentl]

I'm sorry if this may seem TOO simple of a question and I may seem stupid to ask it, but I want some clarity on this matter.

How do you name the key of a piece? I have always thought that you name it depending on what key signature it is on, for instance, Bach's Minuet in G which has one sharp therefore G. What boggles me is that in Chopin's Fantasie Impromptu Op. 66 in C# has four sharps isn't that supposed to be in E?

I hope that you would consider and give the time to answer a beginner's question. Thank you.

[lostinidlewonder]

This might help
https://en.wikipedia.org/wiki/Key_signature

[vincentl]

Oh, now I get it, I feel really stupid not realizing sooner. Thank you very much.

[lostinidlewonder]

There are no stupid questions

[keyboardclass]

Yeh, just stupid answers.