Vince Gill and George Jones each have scheduled late night television appearances for Monday (Nov. 13). In California for a West Coast tour, Gill will appear on The Tonight Show With Jay Leno to perform "Sweet Thing," a track from his four-CD boxed set, These Days. Gill's concert tour continues Tuesday in Bakersfield, Calif., before heading north for concerts in Washington and Oregon. ... Jones, who recently appeared with Kris Kristofferson at New York's Carnegie Hall, returns to the city for a performance on The Late Show With David Letterman. Jones' roadwork resumes with a Tuesday appearance in Syracuse, N.Y.