Background: Shelton was born in Ada, Oklahoma, to Dorothy, a beauty salon owner, and Richard Shelton, a used car salesman. Shelton began singing at an early age and by the age of 12, he was taught how to play the guitar by his uncle. By age 15, he had written his first song. By age 16, he had received a Denbo Diamond Award in his home state.
Context: Shelton released his fourth studio album, Pure BS, in early 2007. Unlike with his first three albums, which were produced entirely by Bobby Braddock, Shelton worked with Braddock, Brent Rowan, and Paul Worley as producers for this album. Its first two singles--"Don't Make Me" and "The More I Drink"--were both Top 20 hits on the country charts, respectively reaching No.12 and No. 19. Also in late 2007, Shelton made appearances on television shows: first as a judge on the talent competition Nashville Star, and later on Clash of the Choirs. Pure BS was re-released in 2008 with three bonus tracks, including a cover of Michael Buble's hit single "Home". This cover, released in early 2008 as the album's third single, became his fourth No.1 hit in July. "Home" was followed in August 2008 by the single "She Wouldn't Be Gone", his 14th chart entry and his fifth No. 1 hit. It was the first time in his career that he had two consecutive number ones. "She Wouldn't Be Gone" is the lead-off to Shelton's fifth studio album, Startin' Fires, which has also produced the single "I'll Just Hold On." This album also includes "Bare Skin Rug," a duet with Lambert. It was produced by Scott Hendricks, except for one track which was produced by Brent Rowan, and another ("I Don't Care", which carried over from Pure BS) was produced by Braddock. After "I'll Just Hold On" fell off the chart in October 2009, Blake Shelton released a duet with Trace Adkins titled "Hillbilly Bone". It was the lead single on Shelton's EP, Hillbilly Bone, released on March 2, 2010 through Reprise Records Nashville. After "Hillbilly Bone" reached No. 1 in February, came the August release of "All About Tonight", the lead-off single to his EP of the same name. In September, he released the second single from All About Tonight, "Who Are You When I'm Not Looking", his 18th single release. He released his first greatest hits album, Loaded: The Best of Blake Shelton in November 2010. Shelton was invited to join the Grand Ole Opry during the September 28, 2010 "Country Comes Home" concert celebrating reopening of the Grand Ole Opry House after the Cumberland River flooded the Opry House in May 2010. The formal invitation was extended on his Twitter account and was announced by Opry star Trace Adkins. He was formally inducted by Adkins at the October 23, 2010 Opry performance. Shelton recorded the title track for the remake of Footloose released on October 14, 2011. Shelton appeared on the 44th Annual Country Music Awards on November 10, 2010 where he performed "All About Tonight" and won Male Vocalist of the Year. In 2011, Shelton started working as a judge/coach to singers on the NBC reality television series The Voice.
Question: What Michael Buble song was covered?

Answer:
Michael Buble's hit single "Home".