Fleetwood Mac, also known as Peter Green's Fleetwood Mac, is the debut album by the band Fleetwood Mac, released in 1968. The album is a mixture of blues covers and originals penned by guitarists Peter Green and Jeremy Spencer, who also share the vocal duties. The release of the album brought the band overnight success; in the UK, the album reached No. 4 and stayed on the charts 37 weeks, despite the lack of a hit single. The album barely made the charts in the US, reaching No. 198. Even though the album has sold over a million copies in the UK, it has never received a certification there. As of June 2015, the album has sold over 150,000 copies in the US. An expanded version of this album was included in the box set The Complete Blue Horizon Sessions.