with la monte young & marian zazeela: tambouras, terry riley: tabla.
and also,
with terry riley: tabla, ann riley & simone forti: tamboura + k. paramjyoti: tabla, la monte young & marian zazeela: tamboura.
two recordings with a quiet intensity, like a cecil taylor played by erik satie.
there is an extreme emotional level as well that contrasts with the drone to create a severely heightened experience.