In February 1994, the three surviving Beatles reunited to produce and record additional music for a few of Lennon's home recordings. "Free as a Bird" premiered as part of The Beatles Anthology series of television documentaries and was released as a single in December 1995, with "Real Love" following in March 1996. These songs were also included in the three Anthology collections of CDs released in 1995 and 1996, each of which consisted of two CDs of never-before-released Beatles material. Klaus Voormann, who had known The Beatles since their Hamburg days and had previously illustrated the Revolver album cover, directed the Anthology cover concept. 450,000 copies of Anthology 1 were sold on its first day of release. In 2000, the compilation album 1 was released, containing almost every number-one single released by the band from 1962 to 1970. The collection sold 3.6 million copies in its first week (selling 3 copies a second) and more than 12 million in three weeks worldwide. The collection also reached number one in the United States and 33 other countries, and had sold 25 million copies by 2005 (about the ninth best selling album of all time).