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

ELI5 answer: does it sound happy, or sad? Happy will be C major, sad will be A minor.

For a song in C, you would hear more major chords like C major, F major, and G major. If it was in A minor, the 4 and 5 would be D minor and E minor instead.