How can the key of C have an A7 and an Fm in?

Liam Gallagher's new song 'What are you dreaming of' is in the key of C but has an A7 in and an Fm.  Both of those chords have flats in.  I dont understand!!  Can someone please make me understand?

?2021-02-08T11:30:21Z

The musical key is a starting point, a foundation if you like. Beyond that, you can be as creative as you like to create the harmonies or tensions you are looking for in your tune. A good example of venturing into related keys and mixing majors and minors of the same chord is in the Dylan song made famous by Adele 'Make You Feel My Love'. Depending how you choose to play it, that song in the key of C includes G, B flat, F, Fm, D7 and E7. I would use a few extras in the transitions  but, even at its simplest, this song demonstrates how musical keys should not be considered a straitjacket.

Tony B2021-02-06T08:45:19Z

In simple terms, a piece of music in the key of C “can” include any chords. It's NOT uncommon for music in C to include chords that use notes that are not in the the C major scale.

Charles2021-02-06T01:28:47Z

Music in any  key can have accidentals, which indicate notes that are not part of the scale for the key signature.  Sometimes there will be a "chromatic" scale in music, such as Flight of the Bumblebee, in which every note is played, sometimes for part of an octave, sometimes for one or two octaves.  Listen to Emily Bear playing Bumblebee Boogie.  I find it fascinating.

yet-knish!2021-02-05T20:23:51Z

What you learn in music theory applies to 18th/19th century music, not to modern-day pop music.  In pop music, things like using A7 in the key of C are very common.  As another answered said, in pop music, intervals are everything.  C to A major, C to A minor--both very common.

Btw, A7 does not have any flats.  Has a sharp.

Ogres are like Onions2021-02-05T19:47:36Z

A is the relative minor of C.  C is the perfect fifth from F.  Intervals are everything.

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