Ashley Monroe faced a dilemma when Blake Shelton contacted her to sing with him on his recording of “Lonely Tonight.”

The two of them now have a major hit, but in annotations they’ve just provided exclusively to Genius.com, Monroe says she had mixed feelings when Shelton made the offer to join him in the recording studio.

“Blake sent me a text that said, ‘I’ve got this song that I really want you to sing on with me, but you can only do it if you like it,’” she writes. “And I thought, ‘Oh, gosh. I hope I like it!’”

Any apprehension went away after Shelton sent her the song written by Brent Anderson and Ryan Hurd.

“He emailed it to me, and I could tell by the first verse that I was in,” she says.

“I think everybody out there has been in a relationship, and it didn’t end abruptly. It just ended,” Shelton writes. “This song is about giving that relationship one last shot.”

In the annotations, Shelton points out that he was the officiant at Monroe’s 2013 wedding to baseball player John Danks. He also reminds us that he and Monroe first collaborated together on “You Ain’t Dolly (And You Ain’t Porter),” a track from her Like a Rose album.

In just nine weeks, “Lonely Tonight,” a track from Shelton’s latest album, Bringing Back the Sunshine, has climbed to No. 12 on Billboard’s country airplay chart.

Check out what they have to say about the song: