It’s also known as circular breathing. I experimented with it when I was playing wind instruments, although I did not perfect the technique. Xome of the more popular musicians who were known for their mastery of this breathing technique were Miles Davis (saxophone); Maynard Ferguson (trumpet and flugelhorn) Sonny Terry (harmonica)(Wikipedia) circular breathing is an important part of the technique for playing the digeridoo, which Iam now learning. The breathing is the hardest part, having put down my wind instruments some 40 years ago, plus the fact that I am living at a higher altitude than I was then.