Hey Bro,
You need to condition your voice for screaming to be able to scream. That's the first thing. The second thing is that you need to be serious about this. If you don't feel like dedicating yourself to this, then don't even try. I've been screaming for only two years and I'm just now getting good. I've had friends who tried and they just couldn't because they didn't try hard enough. They wouldn't stop drinking soda or stop smoking, so they never could figure it out. The key is to keep going and not give up. Face it. You are going to sound bad at first, but keep trying.
This is for screaming high.
So to condition your voice, drink only water and go without soda for about three weeks. When you have that done, warm your voice up by singing. Just play a song that you know and sing along to it. Keep singing it for a few minutes. Notice how your vocal chords feel tense after you keep singing for a while? When they get that tense feeling, you are ready to go. So take a breath and breathe from your diaphragm. And you will surely ask, "How do I breathe from my diaphragm?" Breathe in and don't let your shoulders raise or your chest poke out too much, just let your lungs fill up with air by pushing your stomach out. This is important. If you don't do this, your scream will sound bad, you'll get light headed, you'll hurt your throat, and not be able to hold out screams for nearly as long. You'll know that your doing it right if your stomach pokes out when you do it.
Now sing high in your falsetto and push the air out of your lungs hard, but try to tighten your vocal chords slightly and put the sound in the back of your mouth to make it sound more nasally. To get the right "voice," do this in falsetto. Your falsetto is the voice above your speaking voice. It's the voice Mario and lot of cartoon characters use. Get that Mario voice ready and just keep trying. Scream along to bands that use the same high scream technique, such as Emmure, Beneath The Sky, Bring Me The Horizon, and Job For A Cowboy.
Once you get the high, move on to mids and lows.
I'm no expert, but here are some tips.
1. Warm up by singing first, then start screaming. I do this before every practice, recording session, etc.
2. Drink water, never soda. The carbonic acid in carbonated drinks is terrible for you and your vocal chords.
3. If it hurts, then you are most likely doing it wrong. Minor tenseness or pain is natural. Bleeding, dryness, scratchiness, or intense pain is a good indication that you are doing it wrong and should stop to let your voice heal.
4. To let your voice heal, don't ever use it. Don't talk, sing, hum, scream, or yell, and definitely do not whisper. Start screaming again when you feel better.
5. This is a scream, not a whisper. One of my major problems when I got started was that I didn't push myself enough. Loosen up and just push your voice, but don't push so hard that it kills your throat.
6. I have gotten a lot better just by running and being in shape. It increases your lung capacity so that you can hold screams out longer and make them sound stronger.
That's the way I do it. Also, everyone does things differently, because their bodies are different. Don't tell me I'm wrong or that I'm hurting myself. I'm not. I just do things differently than you do.
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