Do you like to guess what key a song is in?

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Right now I'm trying to figure out what key the radiohead song "15 Steps" is in. I thought it was a relative minor of E flat, but it has a c#.

yes i do. with some songs its really easy, but in others theyll throw in an out of key note or chord or change keys for the chorus or something

It can still have non-diatonic notes in it. Having a C# in it doesn't stop it being in Eb. A song is in the key it's in, and that's that. Non-diatonic notes just make it sound different.

Yeah, it could be modal. I'm too lazy to go find a recording of the song so I can't tell you.

doesnt the key depend on the third note/chord anyway, or at least the tonality of the opening chord? and arent modes just based on keys? i taught myself some music theory by reading online so if im wrong please correct me.

Loosely speaking yes and no, but especially nowadays, wmusicians and writers including myself deliberately avoid what is 'correct' or conventional when writing a song. Bands have been ending on fourths and sixths since the sixties, and even that is 'wrong' as far as music theory.