Billy has been playing guitar since 2011/2012. He's the main guitarist of his band California Chrome. He's seen on very many photos with his guitar. He's also seen with a guitar on his first Instagram photo. Sometimes he post videos on Instagram of him playing guitar. He seems to have many guitars, and he also had guitars in his room on the set of Lab Rats. He plays accoustic guitar and electric guitar, most of the time electric guitar.