After spending a considerable time searching for Wakefield's replacement, Xero recruited Arizona vocalist Chester Bennington, who was recommended by Jeff Blue, the vice president of Zomba Music in March 1999. Bennington, formerly of a post-grunge band Grey Daze, became a standout among applicants because of the dynamic in his singing style. The band then agreed on changing their name from Xero to Hybrid Theory; the newborn vocal chemistry between Shinoda and Bennington helped revive the band, inciting them to work on new material. In 1999 the band released a self-titled extended play, which they circulated across internet chat-rooms and forums with the help of an online 'street team'.