Very often artists rely on auto-tune or backup singers to add harmony or BGVs to their songs. This is a mistake! If you can’t easily sing a Major 3rd harmony or even an octave melody, your voice and ear aren’t fully developed!
Having an understanding of basic music theory, and training your ear to hear notes and the spaces between notes will make you a better singer, songwriter, and a more dangerous artist. Take a hint from some of the top artists in the world, Justin Bieber, Ariana Grande, Beyonce – learn harmony and master it!