The following exercise has me bewildered:
As you can see I instinctively flatted the E and made the key the dominant 7th chord of Bb major. What other key could the author be looking for? Unfortunately there are no examples to go by.
Alternatively, I could have sharped the F, A, and C to make it the dominant 7th chord of B major. But neither of these options can simultaneously describe a dominant 7th chord in two keys, correct?
The chord as I've modified it also is the dominant 7th chord of Bb minor; is that what I'm supposed to put as the second key?
I apologize if this question is not concrete enough, but I'm hoping someone with more experience will see through this mystery.