Pop star Katie Melua and the late Eva Cassidy have topped the U.K. singles chart with a version of the classic Louis Armstrong song What A Wonderful World. The 23-year-old singer's charity collaboration ends Leona Lewis' seven week reign atop of the charts with Bleeding Love. Soulja Boy's track Tell 'Em - Crank That is at number three and Mariah Carey's All I Want For Christmas Is You climbed four places to take fourth spot. Girls Aloud slip into fifth place with their hit Call The Shots. However, Lewis still dominates the album charts with her debut LP Spirit. Westlife took second place with their album Back Home while Michael Buble is third with Call Me Irresponsible. Reformed rockers Led Zeppelin took fourth spot with their LP Mothership while the Eagles' Long Road Out Of Eden is fifth.