Recruiting the latter to one of his bands prompted Campbell to switch his own focus to bass guitar .
While at school , Campbell ( playing guitar and French horn ) met and began to work with aspiring keyboard player Dave Stewart and budding guitarist Steve Hillage .
Recruiting the latter to one of Campbell 's bands Campbell Campbell to switch his own focus to bass guitar .
While at school , Campbell ( playing guitar and French horn ) met and began to work with aspiring keyboard player Dave Stewart and budding guitarist Steve Hillage .