The effects of harmonic resonance on gravity

[Evil Robot]

Quantam physics theory: If two waveforms of different frequencies converge, it is stated that they will form a third harmonic wave form. Such as pressing two keys on a piano, one gets three distinct tones. My question is this, supposing gravity was a wave form only comprised of a force in one direction (ie a single, flat line) could it be reflected just as electromagnetic and sound energy? It has never been proven that gravity is comprised of actual matter, however, it eludes me if gravity can have an effect on electromagnetic energy.

My point is this: When two waveforms of various frequencies converge, the third waveform is produced WITHOUT ANY expenditure of energy. When put into terms of gravitational forces, two planets with converging feilds will produce energy as well as drawing each other closer together