By 2005, Mayer had moved away from the acoustic music that characterized his early records, and begun performing the blues and rock music that had originally influenced him as a musician. He collaborated with blues artists such as B. B. King, Buddy Guy, and Eric Clapton. Forming the John Mayer Trio, he released a live album, "Try!", in 2005 and his third studio album "Continuum" in 2006. Both albums received positive reviews, and "Continuum" earned Mayer a 2007 Grammy Award for Best Pop Vocal Album. He also won Best Male Pop Vocal Performance for "Waiting on the World to Change". That album was followed by "Battle Studies" in 2009, a return to pop, with a Battle Studies World Tour.