Folks who bought Tim McGraw's new album have heard him singing with Taylor Swift on the track “Highway Don’t Care.” But did you know that’s Keith Urban playing a wicked guitar on that song?

“With Keith playing the guitar, he’s just one of the greatest. I think he’s just such an asset to our music,” Tim tells ABC News Radio. “He’s just one of the guys that we should prop up and say that this is somebody we’re proud of.”

Tim notes the instantly memorable song will almost certainly be a single. "I knew it’d be a single when I recorded it, no matter who sang on it, if nobody sang on it," he tells CW. "If it was just a straight-up record with a studio guy and a studio singer on it, it’d have been a single."

And "Highway Don't Care" may not be the end of the Tim-Keith collaborations.

“We still want to find one to sing together on. It’s just finding the right thing,” Tim adds.