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A disc jockey, often abbreviated as DJ, is a person who plays existing recorded music for a live audience. Most common types of DJs include radio DJ, club DJ who performs at a nightclub or music festival, and turntablist who uses record players, usually turntables, to manipulate sounds on phonograph records. Originally, the "disc" in "disc jockey" referred to gramophone records, but now "DJ" is used as an all-encompassing term to describe someone who mixes recorded music from any source, including cassettes, CDs, or digital audio files on a CDJ or laptop. The title "DJ" is commonly used by DJs in front of their real names or adopted pseudonyms or stage names.
Several techniques are used by DJs as a means to better mix and blend recorded music. These techniques primarily include the cueing, equalization and audio mixing of two or more sound sources. The complexity and frequency of special techniques depends largely on the setting in which a DJ is working. Radio DJs are less likely to focus on advanced music-mixing procedures than club DJs, who rely on a smooth transition between songs using a range of techniques. However, some radio DJs are experienced club DJs, so they use the same sophisticated mixing techniques. Club DJ turntable techniques include beatmatching, phrasing and slip-cueing to preserve energy on a dance floor. Turntablism embodies the art of cutting, beat juggling, scratching, needle drops, phase shifting, back spinning and more to perform the transitions and overdubs of samples in a more creative manner (although turntablism is often considered a use of the turntable as a musical instrument rather than a tool for blending recorded music). Professional DJs may use harmonic mixing to choose songs that are in compatible musical keys. Recent advances in technology in both DJ hardware and software can provide assisted or automatic completion of some traditional DJ techniques and skills. Examples include phrasing and beatmatching, which can be partially or completely automated by utilizing DJ software that performs automatic synchronization of sound recordings, a feature commonly labelled "sync". Most DJ mixers now include a beat-counter which analyzes the tempo of an incoming sound source and displays its tempo in beats per minute (BPM), which may assist with beatmatching analog sound sources. In the past, being a DJ has largely been a self-taught craft but with the complexities of new technologies and the convergence with music production methods, there are a growing number of schools and organizations that offer instruction on the techniques.

How do DJ's learn their techniques?

The complexity and frequency of special techniques depends largely on the setting in which a DJ is working.

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Marudur Gopalan Ramachandran (17 January 1917 - 24 December 1987), popularly known as M.G.R., was an Indian actor, filmmaker and politician who served as the Chief Minister of Tamil Nadu for ten years between 1977 and 1987. MGR is a cultural icon in the Indian state of Tamil Nadu, and he is regarded as one of the most influential actors of the Tamil film industry. He was popularly known as "Makkal Thilagam" (People's King) as he was popular with the masses. In his youth, MGR and his elder brother M. G. Chakrapani became members of a drama troupe to support their family.
The actor and politician M. R. Radha and MGR had worked in 25 films together. On 12 January 1967, Radha and a producer visited MGR to talk about a future film project. During the conversation, M. R. Radha stood up and shot MGR in his left ear twice and then tried to shoot himself. After the operation, MGR's voice changed. Since he had been shot in his ear, MGR lost hearing in his left ear and had ringing in the ear problems. These further surfaced in 1983 when he had kidney problems. When Sinnappa Devar paid his first visit to see MGR at the hospital after the shooting incident he paid MGR an advance for MGR's next movie. After getting released from the hospital and finishing Arasakattalai, MGR acted in Devar's movie Vivasaayee against doctors' advice. Due to the operation, MGR's speaking parts in the movie Kaavalkaaran were reduced. This was the only movie in which MGR spoke with old and new voices between scenes: MGR was acting in the film Kaavalkaran in 1967 opposite J. Jayalalithaa when the shooting occurred. Petralthaan Pillaya was the last movie of MGR-MR Radha together. Shooting ended just few days before MGR was shot. The bullet was permanently lodged in his neck and his voice damaged. Within hours of the shooting, some 50,000 fans had gathered at the hospital where MGR had been taken. People cried in the streets. For six weeks, he lay in the hospital as fans awaited each report of his health. He was visited by a steady stream of commoners and luminaries of film industry, polity and bureaucracy. From his hospital bed, he conducted his campaign for the Madras Legislative Assembly. He won twice the number of votes polled by his Congress rival and the largest vote polled by any candidate for the Assembly.

What were the motives?

On 12 January 1967, Radha and a producer visited MGR to talk about a future film project.

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Ai Carina Uemura (Zhi Cun Ai karina, Uemura Ai Karina, born November 2, 1981), known mononymously as Ai (Japanese pronunciation: [ai], stylized as AI or A.I. ) is a Japanese-American singer and songwriter who was born in Los Angeles. Ai spent her childhood in both Kagoshima, Japan and Los Angeles. She debuted as a singer in 2000, later moving to Def Jam Japan and rising to fame with her album 2004 Ai.
Ai was born in Los Angeles in 1981. Her father was Japanese and her mother was half Italian-American and half Japanese. She moved to Kagoshima in Japan when she was 4, and went to elementary school and junior high school in Japan. Ai was motivated to become a singer in her early teens, after singing at a cousin's wedding, having many people ask her if she wanted to be a professional singer, and hearing a gospel performance at the First African Methodist Episcopal Church of Los Angeles in 1993. After graduating from junior high school in Japan, Ai returned to Los Angeles for high school, enrolling at Glendale High School, however found high school difficult due to never formally studying English. After making it through the audition process, she switched to the Los Angeles County High School for the Arts, majoring in ballet. She became a member of the school's gospel choir. In 1998, she performed in a gospel choir at a Mary J. Blige concert at the Universal Amphitheatre, performing of "A Dream." In the same year, she appeared as a dancer in the music video for Janet Jackson's song "Go Deep." In 1999, she joined an Asian girl group called SX4, who were produced by George Brown of Kool & the Gang. Ai was a member of the group for two years, and later in 1999 the group were offered a record label deal. While on her summer holiday in Kagoshima, she performed Monica's "For You I Will" on a local radio station, which led to her being scouted by BMG Japan. She decided to take the offer, and after leaving SX4 and graduating from high school in June 2000, moved to Tokyo and debuted as a musician later in 2000.

What was Ai doing in the year 1981
Ai was born in Los Angeles in 1981.