Who sings I don't love you much do I in the natures own bread ad

Quote

A spokeswoman for the bread company said the version in the commercial was performed by little-known studio musicians and the company's not giving out their names. But you may want to look for a recording of the song by singer-songwriter Guy Clark, who did it as a duet with Emmylou Harris. It's on his 1992 album "Boats to Build."

Official site of Guy Clark featuring lyrics, tickets, bio, pictures, photos, video, songwriter

I was going to suggest going to the website and asking someone there first-hand.

Nature's Own

However, Couchcarrots' answer would appear to cover the bases, but it still might be worth a try to contact someone on the site.

Thanks!