Mix/Mastering

Hey so I have no visions on going into this message but I just really wanted the answer to the question on how do producers sit vocals so perfectly into a mix. Now when I make music it doesn't sound bad, but to push it to professionally sounding music producers make everything sound so nice or like non harsh. I don't know how to explain it because my music isn't even harsh, it's just like even if there's supposed to be louder sounds they just flow perfectly and the vocals sit in it with an airy type of feel. It's like the sun in our solar system (vocals) and all the planets (pads, drums, instruments) are just revolving around it. No harsh frequencies perfect sounds perfect cut through instruments without losing soul in vocals or instruments. How do they do it?