What key is this?

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Question:

What key is Bb-Gm-F?

Answer:

Could be a :
I – vi – V or IV – ii – I

You have options if you’re just playing on your own as you can literally modulate from one key to another.

The key to knowing which ‘key’ you’re in however will depend on :

a) who else you’re playing with as well because you’ll need to decide if you’re in Bb or F Major so that you don’t clash when you play notes that are not from the same key

… or …

b) your preferred melody as the E or Eb note will tell the tune. If you feel an E note fits better in your melody then you’re probably in F major as the V chord of F major is C major with a natural E (CEG). If an Eb sounds better than you’re in Bb major as the ii chord in Bb major is C minor (CEbG).

🙂👍