Mariah Carey, Matchbox 20's Rob Thomas, Sarah McLachlan, and Shania Twain were all honored for their pop songwriting skills during BMI's annual Pop Awards ceremony last night in Beverly Hills, California.Country crossover Shania Twain was the evening's big winner, as "You're Still the One," which she co-wrote with husband Robert "Mutt" Lange, was named Pop Song of the Year. Twain also shared the award for Pop Songwriter of the Year with Carey, Thomas, and McLachlan, as each placed multiple tunes on the BMI list of the most performed songs of 1998. In addition to "You're Still the One," Twain received citations for "From This Moment On," "Love Gets Me Every Time," and "Come On Over." Mariah Carey, who was named the Pop Songwriter of the Year in 1992, was honored for three of her recent hits: "Butterfly," "Honey," and "My All." McLachlan earned BMI awards for "Adia," "Building a Mystery," and "Sweet Surrender," while Thomas was honored for penning the Matchbox 20 songs "Push," "3 AM," and "Real World." Last night's ceremony marked the 47th time that BMI, the American music industry's performing rights organization, has passed out awards honoring some of the most-played and performed songs of the year.