Question: After releasing her fourth studio album, Only One in the World, what musical did Heather Headley debut in?

Context articles: Heather Headley
Big Sean
Martina McBride discography
Led Zeppelin IV
Only One in the World
In My Mind (Heather Headley song)
In My Mind (Heather Headley album)
Audience of One (album)
Fionn Regan
Ruarri Joseph

Heather Headley (born October 5, 1974) is a Trinidadian-American singer, songwriter, record producer, and actress.
 She has won a Tony Award, a Grammy Award, and a Drama Desk Award, and she has been nominated for a host of other acting and music accolades.
Sean Michael Leonard Anderson (born March 25, 1988), known professionally as Big Sean, is an American rapper from Detroit, Michigan.
 Sean signed with Kanye West's GOOD Music in 2007, Def Jam Recordings in 2008 and Roc Nation in 2014.
 After releasing a number of mixtapes, Sean released his debut studio album, "Finally Famous", in 2011.
 He released his second studio album, "Hall of Fame", in 2013.
 Sean's third studio album, "Dark Sky Paradise", was released in 2015 and earned him his first number one album in the US.
 In 2017, he released his fourth studio album, "I Decided", which debuted at number one on the US "Billboard" 200 chart.
The discography of American country artist Martina McBride consists of thirteen studio albums, one live album, four compilation albums, two video albums, three additional albums, forty five music videos, fifty one singles, sixteen other charting songs, and forty five album appearances.
 In 1991, she signed a recording contract with RCA Records, launching her debut studio album "The Time Has Come" in 1992.
 In September 1993, her second studio album "The Way That I Am" was issued.
 Its lead single "My Baby Loves Me" reached number two on the "Billboard" Hot Country Songs chart, becoming her breakthrough hit.
 The third single "Independence Day" peaked in the top twenty and became McBride's signature song.
 The song's success elevated sales of "The Way That I Am" to platinum status from the Recording Industry Association of America. "
Wild Angels" was released in September 1995 and reached number seventeen on the "Billboard" Top Country Albums chart.
 The album's title track became McBride's first song to top the Hot Country Songs list.
 McBride's fourth studio album "Evolution" was released in August 1997 and is her best-selling album to date, certifying three times platinum in the United States.
 The album spawned six singles which all became major hits including, "A Broken Wing", "Wrong Again", and "Whatever You Say".
 After releasing a holiday album, McBride's fifth studio album "Emotion" was issued in September 1999.
 The lead single "I Love You" topped the Hot Country Songs list, while also reaching minor positions on the Adult Contemporary and "Billboard" Hot 100 charts.
The untitled fourth studio album by English rock band Led Zeppelin, commonly known as Led Zeppelin IV, was released on 8 November 1971 by Atlantic Records.
 Produced by guitarist Jimmy Page, it was recorded between November 1970 and January 1971 at several locations, most prominently the Victorian house Headley Grange.
Only One in the World is the fourth studio album by Trinidadian-American singer-songwriter Heather Headley, released on September 25, 2012, just before Headley's West End debut as Rachel Marron in the musical "The Bodyguard".
 It is a collection of original songs and a number of cover versions of pop songs, showtunes and R&B songs.
"In My Mind" is a song by American recording artist Shannon Sanders from his debut studio album, "Outta Nowhere" (1999).
 The song was covered by Trinidadian recording artist Heather Headley for her second studio album of the same name (2006).
 It was released on September 27, 2005 as the album's lead single, peaking at number seventy-five on the "Billboard" Hot 100 in early April 2006, while the song's remixes by the Freemasons and Dave Hernandez topped the Hot Dance Club Play.
In My Mind is the second studio album by Trinidadian R&B-soul singer Heather Headley, released on January 31, 2006 by RCA Records.
 The album was delayed due to the Sony BMG merger, and Headley jokingly stated that it should be titled "Caught Up".
 Heather’s In My Mind album debuted in 2006, which is her first succeeding single album.
 Heather Headley worked with top-notch producers such as Jimmy Jam & Terry Lewis, Ne-Yo, Warryn Campbell, and Lil’ Jon.
 The track named after the album became her first #1 in the Dance Charts.
Audience of One is the third studio album by Trinidadian-American singer-songwriter Heather Headley, released on January 13, 2009 by EMI Gospel.
 It is a collection of cover versions of popular gospel hymns as well as original songs.
Fionn Regan (born 1981) is an Irish folk musician and singer-songwriter.
 Born and raised in Bray, Regan came to prominence with the release of his debut studio album, "The End of History" in 2006.
 He had been releasing extended plays for six years on independent record labels prior to the album's release.
 Regan's second studio album, "The Shadow of an Empire" was released in 2010 to positive reviews and his third studio album, "100 Acres of Sycamore", was released in 2011.
 His fourth studio album, "", was released in 2012.
Ruarri Joseph (born 3 January 1982) is a singer-songwriter.
 He was signed to Atlantic Records and released his debut album, "Tales of Grime and Grit", in mid-2007 on that label.
 Joseph is currently continuing his musical career on his own label, Pip Productions, after deciding to leave Atlantic in early 2008.
 Ruarri released his second album, "Both Sides of The Coin", in February 2009.
 Joseph began work on his third studio album, "Shoulder to the Wheel", later the same year, before releasing it independently in February 2010.
 The album had a wider physical and download release in November 2010, after Joseph secured a new management deal.
 His fourth studio album, "Brother", was released in July 2012.