A Best is the first greatest hits album by Japanese singer-songwriter Ayumi Hamasaki. It was released on March 28, 2001, by Avex Trax and Avex Music Creative Inc. Hamasaki had originally planned to release the greatest hits album after her 2002 studio album I Am..., but the idea was denied by Avex head staff. Instead, Avex released the album in 2001, which caused conflict between the label and Hamasaki. The compilation was released in two different formats including a physical and a digital release. Seven different artworks were released in several editions of the album. The album includes one new track, three re-recorded tracks, and the rest of previously released singles.

"Fly High" is a song recorded by Japanese recording artist Ayumi Hamasaki. It was released by Avex Trax in Japan on February 9, 2000, and through Avex Entertainment Inc. worldwide in September 2008. The recording served as Hamasaki's third and final limited edition single from her second studio album, Loveppears (1999), limiting physical units to 300,000 copies. The track was written by the singer herself, while production was handled by long-time collaborator Max Matsuura. Two versions of "Fly High" were made available for consumption—a radio edit composed by HΛL, and the album version produced by Dai Nagao. Lyrically, the song was written in third person perspective.