From Halopedia, the Halo wiki
Ambient Wonder is the seventh track included in the Halo: Original Soundtrack.
It is defined by a constant, steady to slowly modulating synthesizer tone approximating the sound of an upbeat jazz organ. At 00:14, a slight undertone of shifting higher notes begins to show under the synth melody. Over the next few minutes, these two parts blend and weave together to produce a soft, ambient piece reminiscent of (and based on) the main Halo theme.
It is reorchestrated into the following: