Radio X, referred to as Radio:X in its logo, is an alternative rock/heavy metal/grunge music station in Grand Theft Auto: San Andreas. It is hosted by Sage, an escaped mental patient who holds extremely pessimistic world views. A proud member of Generation X, she is very outspoken against the previous generation and constantly speaks her views on air between songs. Radio X appears to be based on the real-life radio station X103.9 - "The I.E.'s Alternative Rock."
"Head Like a Hole", originally by Nine Inch Nails, was covered by A.F.I. and is featured as a bonus track to the soundtrack collection, even though it's not featured in-game. The original song would most likely be featured on Radio X, given the genre of the song and station.
"Killing in The Name" by Rage Against the Machine is played while the player dates a girlfriend in a wrong Restaurant.
The song, "Unsung" by Helmet also appears on Saints Row 2.