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A gravitational bound state, called a Macro Holeum, is created from a verylarge number of microscopic black holes of primordial or a non-primordialorigin. All of them undergo orbital motion, under the action of gravity, aroundtheir common center of mass. Four classes of Macro Holeum emerge: H, BH, HH andLH. The latter is a massless bundle of gravitational energy moving at the speedof light. The others are Dark Matter objects. BH emits Hawking radiation butthe others do not. The presently existing black holes are identified with BH.All, except LH, emit gravitational radiation due to internal quantumtransitions. Simple analytic formulae are derived for the energy eigenvalues,mass, radius, density and the frequency of the gravitational radiation emittedby Macro Holeums in terms of just two parameters which can be determined fromthe gravitational spectra. We predict that black holes have internal structureand that they and other Macro Holeums, having masses in the range 57 solarmasses to 870 solar masses, would emit hydrogen-like gravitational radiation inthe LIGO frequency range in the form of band or line spectra with aconsiderable overlapping of the bands. This will be superposed on a uniformbackground radiation coming from Macro Holeums at large distances greater than100 Mpc.  04.60.-m, 04.60.Bc, 04.30.-w, 04.30.Tv, 95.35.+d, 95.36.+x

Quantized Gravitational Radiation from Black Holes and other Macro Holeums in the Low Frequency Domain