Some context: Utada Hikaru (Yu Duo Tian  hikaru, born January 19, 1983), who also goes by the mononym Utada (English: ), is a Japanese-American singer-songwriter and producer. Born in New York City to Japanese parents, record producer Utada Teruzane and enka singer Abe Junko, Utada began to write music and lyrics at an early age and often traveled to Tokyo, as a result of her father's job. Eventually, a recording contract with Toshiba-EMI was signed and, under the stage name "Cubic U", Utada released her English-language debut album Precious in early 1998, but was a commercial failure. In the following year, heavily influenced by R&B and dance-pop, her Japanese-language debut First Love was released and became an instant success.
On December 16, 2008, information leaked onto the Internet that Utada's next English-language single, titled "Come Back to Me", would be scheduled for airplay release through U.S. Rhythmic/Crossover and Mainstream formats on February 9 and 10, 2009 respectively via Island Records. The new English album, titled This Is the One, was released on March 14, 2009 in Japan and on May 12, 2009 in the United States. This Is the One debuted at number 1 in Japan on March 13, 2009, the day it was released in Japan, but became Utada's first album not to top the weekly chart since Precious. On March 30, 2009 she appeared on New York City radio station Z-100 (100.3), the largest pop radio program in the U.S., and granted a live on-air interview on the station's Elvis Duran Morning Show, a breakthrough that would lead to a promotional schedule up and through the album's international physical release on May 12. Utada also sang the theme song for the second Evangelion film, Evangelion: 2.0 You Can (Not) Advance. The single was released on June 27, 2009, and is a remix of her previous single, "Beautiful World". The new single is titled Beautiful World -PLANiTb Acoustica Mix-.  On October 14, Utada stated that she was writing lyrics that were due on October 15. She also added that some "German magic" would be added to the music. It was revealed that Goetz B, who had previously worked with Utada on her album Ultra Blue was in the process of mixing tracks for her.  On November 30, 2009, at Studio Coast, Tokyo, Utada sung a duet of Let It Snow with pop singer Mika.  On December 21, 2009, Utada's Dirty Desire remixes were released only on Amazon.com, Zune Marketplace, and the U.S. iTunes Store, in support of This Is the One and her upcoming tour. The tour, Utada: In the Flesh 2010, was her first concert tour outside Japan and included eight cities in the US and two dates in London, UK. The tickets for the second London performance went on public sale November 13, and reportedly sold out in just 5 hours.
Who did she sing the duet with?
A: pop singer Mika.
Some context: Umar was born in Mecca to the Banu Adi clan, which was responsible for arbitration among the tribes. His father was Khattab ibn Nufayl and his mother was Hantama bint Hisham, from the tribe of Banu Makhzum. In his youth he used to tend to his father's camels in the plains near Mecca. His merchant father was famed for his intelligence among his tribe.
Umar attended the event of Ghadir Khumm, which took place a few months before Muhammad passed away. According to both Shia and Sunni sources, he was among the many who pledged allegiance to Ali at the event.  In Medina, after the Farewell Pilgrimage and the event of Ghadir Khumm, Muhammad ordered an army under the command of Usama bin Zayd. He commanded all the companions, except for his family, to go with Usama to Syria to avenge the Muslims' defeat at the Battle of Mu'tah. Muhammad gave Usama the banner of Islam on the 18th day of the Islamic month of Safar in the year 11 A.H. Abu Bakr and Umar were among those that Muhammad commanded to join Usama's army.  However, Abu Bakr and Umar resisted going under the command of Usama because they thought that he, who was 18 or 20 at the time, was too young to lead an army, despite Muhammad's teachings that age and standing in society did not necessarily correspond to being a good general.  In response to these worries, the Prophet said: "O Arabs! You are miserable because I have appointed Usama as your general, and you are raising questions if he is qualified to lead you in war. I know you are the same people who had raised the same question about his father. By God, Usama is qualified to be your general just as his father was qualified to be a general. Now obey his orders and go." Whenever Muhammad felt any relief from his fatal sickness, he would inquire as to whether Usama's army had left for Syria yet, and would continue urging his companions to leave for Syria. Muhammad even said, "Usama's army must leave at once. May Allah curse those men who do not go with him." However, while a few companions were ready to join Usama's army, many other companions, including Abu Bakr and Umar, disobeyed Muhammad's orders. It is also noted that this was the only battle expedition where Muhammad urged his companions to go the battle no matter what; for other battles, if someone was unable to go to the fight, Muhammad would let them stay at home.
What happened as a result of him refusing to follow under him?
A:
Now obey his orders and go.