Aerial is the eighth album by the English singer-songwriter and musician Kate Bush. It was released as a double album in 2005, twelve years after her 1993 album The Red Shoes. Aerial is Bush's first double album, and was released after a twelve-year absence from the music industry during which Bush devoted her time to family and the raising of her son, Bertie. The anticipation leading up to the album's release was immense, with press articles devoted to Bush being printed months, even years before.[1] Like Bush's previous album, The Red Shoes, Aerial does not feature a cover photograph of Bush, but rather one that is emblematic of the album's celebration of sky, sea, and birdsong. The cover image, which seems to show a mountain range at sunset reflected on the sea is in fact a waveform of a blackbird song superimposed over a glowing photograph. Aerial is one of Bush's most critically acclaimed albums.[2] Musically, the album is a multi-layered work, incorporating elements of folk, Renaissance, classical, reggae, flamenco, and rock. As with 1985's Hounds of Love, the album is divided into two thematically distinct collections. The first disc, subtitled A Sea of Honey, features a set of unrelated songs including the hit single "King of the Mountain", a Renaissance-style ode to her son "Bertie", performed with period instruments, and "Joanni", based on the story of Joan of Arc. In the song "{\displaystyle \pi }\pi ", Bush sings the number to its 78th decimal place, then from its 101st to its 137th decimal place.[3][4] The piano and vocal piece "A Coral Room", dealing with the loss of Bush's mother and the passage of time, was hailed by critics as "stunning" in its simplicity,[5] "profoundly moving"[6] and as "one of the most beautiful" pieces Bush has ever recorded.[6] The second disc, subtitled A Sky of Honey, consists of a single piece of music revelling in the experience of outdoor adventures on a single summer day, beginning in the morning and ending twenty-four hours later with the next sunrise.[7] The songs are saturated with the presence of birdsong, and all refer to the sky and sunlight, with the sea also featuring as an important element. Beginning with blackbirds singing in the dawn chorus, a woodpigeon cooing, solo piano, and Bush's son saying, "Mummy, Daddy, the day is full of birds," the piece begins with an early morning awakening to a beautiful day of sun shining "like the light in Italy"; it proceeds through a visit with a painter who is working on a new piece of pavement art ("An Architect's Dream" and "The Painter's Link") and then passes on to a crimson "Sunset". The interlude "Aerial Tal", consists of Bush imitating various samples of birdsong, while "Somewhere in Between" celebrates the ambiguous nature of dusk. "Nocturn", features a pair of lovers bathing in the sea after dark under a star-studded "diamond sky". The song cycle ends with "Aerial" and its euphoric welcome of the following morning's sunrise with the refrain "I need to get up on the roof...in the sun." A Sky of Honey features Rolf Harris playing the didgeridoo and providing vocals on "An Architect's Dream" and "The Painter's Link". Other guest artists include Peter Erskine, Eberhard Weber, Lol Creme and Procol Harum's Gary Brooker. In one of his final projects before his death in 2003, long-time Bush collaborator Michael Kamen arranged the string sections, performed by the London Metropolitan Orchestra.[citation needed] In the 2014 series of concerts in London, Before the Dawn, Bush performed "King of the Mountain," "Joanni" and the whole Sky of Honey song cycle live for the first time.