I basically just want to learn to sing metal, not screamo death metal, but with a good rasp to my voice. I can sing with a regular voice, I just need help adding stamina and rasp to my voice. well those singers dont always sing like that. i suggest you listen to the song (if you havent already)... Through Glass by Stone Sour. its the lead singer of slipknot's other band and it shows he has actual talent and i duno about other bands but i suggest you make sure you have actual talent (no offence intended) and then practise yelling. maybe just a simple AHHHHHHHHHHHHHHHHHHHHH as warm ups etc but yeah practise makes perfect...or not perfect but improvement.
good luck. u can't just learn to sing you gotta actually have a rock style of voice.. i mean you can learn... but you can't just automatically sound good... its something you're born with almost | 