Plot: ALL ABOUT TAMMY LEE; Tammy Lee Didawick (Tracey Ullman) is the personal assistant to Dee Dee Pernell (Julie Kavner), a drunken, washed up, country-western singer who plans to go on a tour despite her drinking problem. When Dee Dee passes out, the crafty Tammy Lee plots to take her place in the spotlight at her first country-western concert