Albums of recorded music were developed in the early 20th century, first as books of individual 78rpm records, then from 1948 as vinyl LP records played at 33 1⁄3 rpm. Vinyl LPs are still issued, though in the 21st century albums sales have mostly focused on compact disc (CD) and MP3 formats. The audio cassette was a format used in the late 1970s through to the 1990s alongside vinyl.
An album may be recorded in a recording studio (fixed or mobile), in a concert venue, at home, in the field, or a mix of places. Recording may take a few hours to several years to complete, usually in several takes with different parts recorded separately, and then brought or "mixed" together. Recordings that are done in one take without overdubbing are termed "live", even when done in a studio. Studios are built to absorb sound, eliminating reverberation, so as to assist in mixing different takes; other locations, such as concert venues and some "live rooms", allow for reverberation, which creates a "live" sound. The majority of studio recordings contain an abundance of editing, sound effects, voice adjustments, etc. With modern recording technology, musicians can be recorded in separate rooms or at separate times while listening to the other parts using headphones; with each part recorded as a separate track.
Salyu (サリュ, Saryu, born October 13, 1980) is a Japanese singer, produced by Takeshi Kobayashi. She debuted in 2000 as the fictional singer Lily Chou-Chou for the film All About Lily Chou-Chou, and later debuted as a solo artist in 2004. She is best known for her charity single collaboration with Bank Band in 2006, "To U." Salyu has also worked as a voice actress for the Japanese-language version of the game Professor Layton and the Diabolical Box (2007), in which she voiced the character Mrs. Rose (ローズ夫人, Rōzu Fujin) (known as Babette in the English version). In 2011, Salyu embarked on a new solo project going by the name salyu × salyu (サリュ バイ サリュ, Saryu Bai Saryu).
Much of Salyu's personal information and history has not been revealed publicly. Her official website's profile, for example, only lists her musical releases and commercial tie-ups, as opposed to her background. However, she has revealed two personal facts about herself in her blog: her first name is Ayako (綾子) and that she has four siblings. Her older brother, Daisuke Mori (森大輔) was a former professional rugby union player, for the Toshiba Brave Lupus team.