""MTV Unplugged"" presents Atlanta-based singers/songwriters/guitarists Amy Ray And Emily Saliers -- collectively known as the Indigo Girls -- and solo artist Michelle Shocked. Shocked performs ""Jamboree Queen,"" ""On The Greener Side,"" and ""The Water Is Wide."" The Indigo Girls perform ""World Falls,"" and ""Closer To Fine,"" from their self-titled LP. Shocked joins host Jules Shear to revive the Jimmy Rodgers song ""T For Texas."" An excerpt from the MTV Unplugged book...""These two artists embody what we were attempting to accomplish with the early shows: guitar, voice, song. Nothing more, nothing less. During this adolescent stage of Unplugged, Jules used to warm up the crowd with an old Jimmie Rodgers song, 'T for Texas.' For this program, he actually broke it out for the camera. At one point during the song - a duet with Michelle Shocked - Jules sang a note for 18 seconds (You try it). Everyone - Michelle included - stared dumbfounded. Finally, Michelle was so flabbergasted that she broke in