What is the best way to identify correctly if a song is in C major scale or A minor scale, because notes are all the same?

Question

What is the best way to identify correctly if a song is in C major scale or A minor scale, because notes are all the same?

In: Other

Answer 1

Besides the happy/sad answer, I’ll give an example of a song for each:

“My Girl” by the Temptations is in C Major

“Midna’s Lament” from LoZ: Twilight Princess, is mostly in A Minor.