Lyle Lovett was identified early in his career as a country artist, while John Hiatt was shoved under the rock umbrella, subgenre “roots.’’ But at the Wilbur Theatre on Thursday, they were just two singers, each with an acoustic guitar and a quarter century of material behind him. Free of the performers’ large-scale touring bands, the two-hour show was a combination songwriters’ showcase and living-room palaver. (They return to the Wilbur tomorrow.)
The old friends have made it an almost yearly tradition since 1989, and they took to it with the ease of a holiday. The singers alternated with each other, and collaboration was kept to a minimum, with Hiatt plucking along with just a small handful of Lovett’s songs. Mostly, they sat and fondly watched one another. After Hiatt finished a spirited “Drive South,’’ Lovett quietly announced “I quit.’’