Two woe-filled stories about female singing trios trios get a spotlight in each of two features--complete with their painful journeys to make it big as well as their ultimate triumphs. IncludesSparkle(Irene Cara, Lonette McKee, Dwan Smith. 1976/98 min.) andDreamgirls(Beyonce Knowles, Jennifer Hudson, Jamie Foxx, Eddie Murphy. 2006/130 min.). 2 DVDs. Color/PG-13/widescreen.