How to determine the Key?
I understand some music theory.
But I don’t understand how to deteremine if a tune is in Dmaj, or Amix, or Edor , or Bmin (all have 2 sharps).
Do you simply use the main notes of the tune to decide?
ex:|E2BE dEBE| = Edor, whereas |D2F#D ADF#D| = Dmaj?