Question: What is the theme song for the 2005 video game "Civilization IV"?

Context paragraphs:
Civilization: The Card Game: Civilization: The Card Game is a card game designed by "Civilization IV" lead designer Soren Johnson, based on "Civilization IV".  It was developed in 2006 by Firaxis Games, as a bonus in the "Sid Meier's Civilization Chronicles" boxed set (a collection of every "Civilization" series game up to that point), and is not available independently.

Civilization IV: Beyond the Sword: Sid Meier's Civilization IV: Beyond the Sword is the second official expansion pack of the turn-based strategy video game "Civilization IV".  The expansion focuses on adding content to the in-game time periods following the invention of gunpowder, and includes more general content such as 11 new scenarios, 10 new civilizations, and 16 new leaders.

Rhye's and Fall of Civilization: Rhye's and Fall of Civilization (RFC) is a "fan scenario" (mod) for the 2005 computer game "Sid Meier's Civilization IV".  It is an 'Earth simulator' that uses a variety of scripted events to mirror history much more closely than a typical game of "Civilization".  The name of the scenario references its core feature—the dynamic "Rise and Fall" of civilizations through time—and its creator, Gabriele Trovato, known as "Rhye" in the forums community.

Civilization III: Sid Meier's Civilization III is the third installment of the "Sid Meier's Civilization" turn-based strategy video game series.  It was preceded by "Civilization II" and followed by "Civilization IV", and it was released in 2001.  Unlike the original game, "Civilization III" was not designed by Sid Meier, but by Jeff Briggs, a game designer, and Soren Johnson, a game programmer.

Civilization IV: Colonization: Sid Meier's Civilization IV: Colonization is a remake (a total conversion using "Civilization IV" engine) of the 1994 turn-based strategy game "Sid Meier's Colonization".  Players control settlers from one of four European nations, Spain, England, France, or the Netherlands, that are trying to conquer/colonize the New World in the period between 1492–1792.  The final goal of each player is to build up their colonies and a standing army, then declare independence from their mother country and defeat the military force that the King sends to crush the rebellion.

Civilization (2010 board game): Sid Meier's Civilization: The Board Game is a 2010 board game created by Kevin Wilson based on the "Sid Meier's Civilization" series of video games and published by Fantasy Flight Games.  While the based on "Sid Meier's Civilization", published by Eagle Games in 2002, was based on "Civilization III", the 2010 version takes its primary inspiration from "Civilization IV".  Its expansions, "Fame and Fortune" and "Wisdom and Warfare", also began to incorporate concepts derived from "Civilization V".

Baba Yetu: "Baba Yetu" is a song by composer Christopher Tin.  It was composed in 2005 when video game designer Soren Johnson, Tin's former roommate at Stanford, asked him to compose the theme song for "Civilization IV".  It was sung by Ron Ragin and the Stanford Talisman.  For its re-release in Tin's debut album "Calling All Dawns", it was sung by Ron Ragin and the Soweto Gospel Choir.

Civilization IV: Sid Meier's Civilization IV is a turn-based strategy computer game and the fourth installment of the "Civilization" series.  It was designed by Soren Johnson under the direction of Sid Meier and his video game development studio Firaxis Games.  It was released in North America, Europe, and Australia, between October 25 and November 4, 2005.

Civilization IV: Warlords: Sid Meier's Civilization IV: Warlords is the first official expansion pack of the critically acclaimed turn-based strategy video game "Civilization IV".

Calling All Dawns: Calling All Dawns is a classical crossover album by Christopher Tin released in 2009.  The album won two Grammys at the 53rd Grammy Awards for Best Classical Crossover Album and Best Instrumental Arrangement Accompanying Vocalist(s) for the song "Baba Yetu", the theme for the 2005 video game "Civilization IV".  The win marks the first time in history that a Grammy has been awarded to a composition written for a video game.

Supporting paragraphs: Calling All Dawns Baba Yetu
Answer: Baba Yetu