What is key signature has B flat E flat and A flat?

Answer:
The key signature is E flat major, which is also, C minor, the relative minor of E flat major. You can find out what flat key signature you're in by finding the second to last flat (in this case E flat). It is the major version of that key signature!
First answer by 12345EP. Last edit by 4redwood. Contributor trust: 10 [recommend contributor recommended]. Question popularity: 38 [recommend question].