Sandi Sylver: Storyteller-Ventriloquist-Songstress   ADULT PERFORMANCES   "Stories and Songs of Life, Love and Laughter," my shows for adults, are listed in "The Best of the Best" directory for adult shows performed in Illinois Public Libraries.  This is a true honor, as one must be nominated for inclusion.   A potpourri of material that ranges from thought provoking to hilarious to warm and fuzzy, I include songs from the 20's, 30's, and 40's, as well as contemporary tunes, to enhance and compliment various stories. Having led a most interesting life, there are autobiographical tales you may not believe are true, but most certainly are!  Of course, "The Girls" perform in each and every show. I will also teach the audience the basics of ventriloquism if there is interest.   These shows are presented not only at libraries but also at festivals, coffee house cabarets,churches, synagogues, Park District seniors' lunches, and at Senior residences of all kinds.