SiriusHub
From Halopedia, the Halo wiki
SiriusHub is a human company specializing in (presumably) satellite radio, although it appears to be a much more advanced version than our current technology allows. In particular, the ability to "...connect to SiriusHub and access anything you like...",[1] shows that it is very advanced indeed, and suggests that it also has the ability to download music, not just the ability to listen to it.
A radio from this company was included with the stock model of the '53 Civilian Warthog.
Trivia
The name SiriusHub suggests that this company is a descendant of the real world company Sirius Satellite Radio.
