By humming while blowing air into a Saxophone. Creating a raspy rock tone to your playing. Growl takes many years to perfect. But while playing the deeper your humming, while being off-key your Growl will sound even better!
On my solo last night at the Jazz Concert. I Growled so well to the best of the song!

My Saxophone Growl get's better every time I try it!
by Jazzy Chase June 3, 2010
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