Music: --The Emotions (performing live) - "Whole Lot of Shakin'," "Walking The Line," "Best of My Love," "Smile" and "Flowers." --Lenny Williams - "You Got Me Running" and "Cause I Love You." --Blondie (music video) - "Denis." --Alice Cooper (music video) - "How You Gonna See Me Now?" --Richie Blackmore's Rainbow (music videos) - "Long Live Rock N Roll" and "Gates of Babylon." Comedy: --David Letterman (stand-up comedian) --Village Idiots (comedy troupe, series regulars) - perform two "Rock Rap" music news sketches.