[Juan Luis Guerra photo by Jaime E. de Marchena. Courtesy of AllMusic.com]JLG & 4.40 Rock Latin Grammys4.40 leader Juan Luis Guerra did his best Carlos Santana-in-'99 impersonation last night at the Latin Grammy Awards in Las Vegas by earning distinctions for Album of the Year, Song of the Year, Record of the Year, Best Merengue Album and Tropical song for La Llave de Mi Corazón and its title track. It also won a Latin Grammy for Best Engineered Album, and top it off, the beloved merenguero was this year's Latin Recording Academy Person of the Year as well.