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

An easy way is to check the last note. It’s common for a song to end on the key (so a song in C major would end on a C note or C major chord)