Tim McGraw has scored another No. 1 hit. The 46-year-old took time out of his busy schedule on Aug. 20 to celebrate his single, 'Highway Don't Care,' soaring to the top of the charts.

The tune, which features guest vocals by Taylor Swift and Keith Urban on guitar, is from his debut album on Big Machine Records, 'Two Lanes of Freedom.' McGraw says the song, written by Mark Irwin, Josh Kear, Brad Warren and Brett Warren, was so successful partly because of Swift's contribution.

"Taylor, on 'Highway Don't Care,' I never had a second thought that that's who I wanted to sing that part on that song, and that record wouldn't be the same without her singing it," he insists. "I think she just brings something special to it. Not only because she's Taylor Swift, but the quality that she brings, and the vulnerability in her vocal on that record is just spectacular."

McGraw adds he was thrilled to have finally found a song that was a perfect fit for Urban to add his guitar skills as well. "I've been looking for something for Keith to play on for me for years, because I'm a big fan of Keith's," he says. "I think he's one of the best artists we have out there."

'Two Lanes of Freedom' marks McGraw's 34th journey to the No. 1 spot, but it's the songwriters, he says, who deserve much of the credit. "Everything starts with a song," he maintains, "and I think some of the best poets that have ever lived, live in this town."

McGraw is filming an upcoming movie, and getting ready to return to Las Vegas with his wife, Faith Hill, for their Soul2Soul show at the Venetian. Keep track of his schedule here.