Problem: Background: Isaac Asimov (; c. January 2, 1920 - April 6, 1992) was an American writer and professor of biochemistry at Boston University. He was known for his works of science fiction and popular science. Asimov was a prolific writer who wrote or edited more than 500 books and an estimated 90,000 letters and postcards. His books have been published in 9 of the 10 major categories of the Dewey Decimal Classification.
Context: Asimov was born on an unknown day between October 4, 1919 and January 2, 1920, inclusive. Asimov himself celebrated it on January 2. Asimov's parents were Anna Rachel (nee Berman) and Judah Asimov, a family of Jewish millers. He was named Isaac after his mother's father, Isaac Berman. When he was born, his family lived in Petrovichi near Klimovichi, which was then Gomel Governorate in the Russian Soviet Federative Socialist Republic (now Smolensk Oblast, Russia). Asimov wrote of his father, "My father, for all his education as an Orthodox Jew, was not Orthodox in his heart", noting that "he didn't recite the myriad prayers prescribed for every action, and he never made any attempt to teach them to me". In 1921, Asimov and 16 other children in Petrovichi caught double pneumonia. Only Asimov survived. He later had two younger siblings: a sister, Marcia (born Manya, June 17, 1922 - April 2, 2011), and a brother, Stanley (July 25, 1929 - August 16, 1995), who was vice-president of New York Newsday. His family emigrated to the United States when he was three years old. Since his parents always spoke Yiddish and English with him, he never learned Russian, but he remained fluent in Yiddish as well as English. Growing up in Brooklyn, New York, Asimov taught himself to read at the age of five, and his mother got him into first grade a year early by claiming he was born on September 7, 1919. In third grade he learned about the "error" and insisted on an official correction of the date to January 2. After becoming established in the U.S., his parents owned a succession of candy stores, in which everyone in the family was expected to work. The candy stores sold newspapers and magazines, a fact that Asimov credited as a major influence in his lifelong love of the written word, as it presented him with an unending supply of new reading material as a child that he could not have otherwise afforded. He became a naturalized U.S. citizen in 1928 at the age of eight.
Question: What day was he born on
Answer: an unknown day

Problem: Background: Kerli Koiv was born in Elva on February 7, 1987. Her mother, Piret Koiv, was a social worker, and her father, Toivo Koiv, was an auto mechanic. Her parents separated when she was 16. Kerli has stated that when she wrote "Supergirl"--a song about domestic violence written for Utopia--she "put [herself] in [her] mother's body, and said things that [she] wished that [her mother] would've said to her dad when [she] was little".
Context: In 2006, Kerli worked with producer, songwriter, and mixer David Maurice on an autobiographical set of songs, the first set of which were released on a self-titled EP in 2007. She finally released her debut album, titled Love Is Dead on July 8, 2008, following her debut single "Walking on Air" (which charted at number 75 on the European Hot 100.) and "Creepshow", a promotional single. "Creepshow" was featured in the TV series Fringe, The City, as well as in the video game Burnout Paradise. The music video for the song "Love Is Dead" was released on February 29, 2008 and the music video for "Walking on Air" premiered on MTV Overdrive on May 20, 2008. "Walking on Air" was downloaded 550,000 times when it was featured as iTunes' "Single of the Week", which was a record at the time. The song appeared twice on So You Think You Can Dance? as well in an advertisement for Fringe. Love Is Dead charted at number 126 on the Billboard 200 for the week of July 26. Later in 2008, she was selected to perform a song titled "When Nobody Loves You" for the video game 007: Quantum of Solace, as well as the song "Bulletproof" on the official soundtrack of Punisher: War Zone. In 2009, Kerli performed at the Estonian music festival Ollesummer in Tallinn. On September 10, 2009 Island Def Jam announced Kerli's iPhone application and the first song, Saima was released the following month. Kerli re-released her song "The Creationist"as a duet with the Italian songwriter Cesare Cremonini. Kerli received a European Border Breakers Award for the success of the album Love Is Dead in Estonia.
Question: What did Kerli release next?
Answer: She finally released her debut album, titled Love Is Dead

Problem: Background: Ellington was born on April 29, 1899, to James Edward Ellington and Daisy (Kennedy) Ellington in Washington, D.C. Both his parents were pianists. Daisy primarily played parlor songs and James preferred operatic arias.
Context: From 1936, Ellington began to make recordings with smaller groups (sextets, octets, and nonets) drawn from his then-15-man orchestra and he composed pieces intended to feature a specific instrumentalist, as with "Jeep's Blues" for Johnny Hodges, "Yearning for Love" for Lawrence Brown, "Trumpet in Spades" for Rex Stewart, "Echoes of Harlem" for Cootie Williams and "Clarinet Lament" for Barney Bigard. In 1937, Ellington returned to the Cotton Club which had relocated to the mid-town Theater District. In the summer of that year, his father died, and due to many expenses, Ellington's finances were tight, although his situation improved the following year. After leaving agent Irving Mills, he signed on with the William Morris Agency. Mills though continued to record Ellington. After only a year, his Master and Variety labels, the small groups had recorded for the latter, collapsed in late 1937, Mills placed Ellington back on Brunswick and those small group units on Vocalion through to 1940. Well known sides continued to be recorded, "Caravan" in 1937, and "I Let a Song Go Out of My Heart" the following year. Billy Strayhorn, originally hired as a lyricist, began his association with Ellington in 1939. Nicknamed "Swee' Pea" for his mild manner, Strayhorn soon became a vital member of the Ellington organization. Ellington showed great fondness for Strayhorn and never failed to speak glowingly of the man and their collaborative working relationship, "my right arm, my left arm, all the eyes in the back of my head, my brain waves in his head, and his in mine". Strayhorn, with his training in classical music, not only contributed his original lyrics and music, but also arranged and polished many of Ellington's works, becoming a second Ellington or "Duke's doppelganger". It was not uncommon for Strayhorn to fill in for Duke, whether in conducting or rehearsing the band, playing the piano, on stage, and in the recording studio. The 1930s ended with a very successful European tour just as World War II loomed in Europe.
Question: Any other aspects of his career happen during this time frame?
Answer:
Billy Strayhorn, originally hired as a lyricist, began his association with Ellington in 1939.