In the Beginner level, you could easily just look at the key signature ad tell which scale did the music piece belong to. But now since, you know that the raltive majors and minors share the same key signature we need to be a lil more careful. Here are two examples for you to understand better.
1.
Are there any flats or sharps in the key signature ? Yes, one sharp, so the key could be either a G-major or E-minor.
Are there any accidentals in the music that could be a raised 7th degree in the relative minor (to make it a harmonic minor) ? NO
Are there any other reason to think that the key id G major ? Yes, the first two bars are based around the tonic triad broken chord and the last note is a G
Answer : The Key Is G-major
2.
Are there any flats or sharps in the key signature ? Yes, one flat, so the key could be either a F-major or D-minor.
Are there any accidentals in the music that could be a raised 7th degree in the relative minor (to make it a harmonic minor) ? Yes (so the key is probably a minor)
Are there any other reason to think that the key id G major ? Yes, the second last bar centres around D and uses a raised 7th degree. The Last note is D.
Answer : The Key Is D-minor (Harmonic).
So, yeah any time you tackle something like this, just ask yourselves these questions, look for broken chords and triads, see the beginning and the ending note of the piece and then you'll be to figure out the key of the piece.
See ya next time !
PEACE ! 🎼 👈 that’s a treble clef btw :)