instruction:
In this task, you're expected to write answers to questions involving multiple references to the same entity. The answer to the question should be unambiguous and a phrase in the paragraph. Most questions can have only one correct answer.
question:
Passage: The identity of the donor has not been established, although a number of suggestions have been advanced over the last 200 years. Harbison suggests the work's small scale indicates that it functioned as a portable altarpiece rather than as a private devotional work, and thus was commissioned by or for a member of the clergy. Other art historians have argued that the donor may have been a Genoese merchant. This belief has been fed by the triptych's similarity to Giovanni Mazone's Virgin and Child altarpiece in Pontremoli, Tuscany, which may place it in the Italian region of Liguria at latest by the end of the 15th century. Damaged coats of arms on the inner frames have been linked to the Giustiniani family, known for establishing trade links with Bruges in the 14th and 15th centuries. If not commissioned by that family, historical record place the work at least in their possession by the end of the century. In the early 1800s, Frances Weale attempted to place Michele Giustiniani as the donor, however later historical research has been unable to verify his presence in Bruges around 1437, and he seems to have returned to Italy by 1430.Mid-twentieth century technical examination revealed the Giustiniani coats of arms may have been painted over an earlier heraldic design, perhaps as early as the 15th century, whose signifiance and history is now lost. Dhanens theorises that a member of the Giustiniani family may have established other associations with St. Michael and St. Catherine, advancing that they were a member of the Italian Rapondi family, whose trading house in Paris was named after St. Catherine. Their daughter, also named Catherine, married the Italian merchant Michel Burlamacchi (Bollemard in Flemish) from Lucca, who was active in Bruges. From this Dhanens theorises the piece was commissioned as a wedding gift for the couple. Documents show weavers in Wervik paid taxes to Catherine Rapondi and in September 1434, when Michele Burlamacchi was tax collector in that town, van Eyck received a stipend funded by local tax receipts, suggesting a connection. Dhanens admits the donor's identity is lost, but she says of the piece that "it could have been a gift from the husband to the wife, a pledge of his affection during his absences; or it could have been a gift from the wife to the husband, by way of protection on his travels.". 
Question: What is the last name of the person who married the Italian merchant Michel Burlamacchi?
answer:
Rapondi.


question:
Passage: In February 1935, at Bridge's instigation, Britten was invited to a job interview by the BBC's director of music Adrian Boult and his assistant Edward Clark. Britten was not enthusiastic about the prospect of working full-time in the BBC music department and was relieved when what came out of the interview was an invitation to write the score for a documentary film, The King's Stamp, directed by Alberto Cavalcanti for the GPO Film Unit.
Britten became a member of the film unit's small group of regular contributors, another of whom was W. H. Auden. Together they worked on the documentary films Coal Face and Night Mail in 1935. They also collaborated on the song cycle Our Hunting Fathers (1936), radical both in politics and musical treatment, and subsequently other works including Cabaret Songs, On This Island, Paul Bunyan and Hymn to St. Cecilia. Auden was a considerable influence on Britten, encouraging him to widen his aesthetic, intellectual and political horizons, and also to come to terms with his homosexuality. Auden was, as David Matthews puts it, "cheerfully and guiltlessly promiscuous"; Britten, puritanical and conventional by nature, was sexually repressed.In the three years from 1935 to 1937 Britten wrote nearly 40 scores for the theatre, cinema and radio. Among the film music of the late 1930s Matthews singles out Night Mail and Love from a Stranger (1937); from the theatre music he selects for mention  The Ascent of F6 (1936), On the Frontier (1938) and Johnson Over Jordan (1939); and of the music for radio, King Arthur (1937) and The Sword in the Stone (1939).In 1937 there were two events of huge importance in Britten's life: his mother died, and he met the tenor Peter Pears. Although Britten was extraordinarily devoted to his mother and was devastated at her death, it also seems to have been something of a liberation for him. Only after that did he begin to engage in emotional relationships with people his own age or younger. Later in the year he got to know Pears while they were both helping to clear out the country cottage of a mutual friend who had died in an air crash. Pears quickly became Britten's musical inspiration and close (though for the moment platonic) friend. Britten's first work for him was composed within weeks of their meeting, a setting of Emily Brontë's poem, "A thousand gleaming fires", for tenor and strings.During 1937 Britten composed a Pacifist March to words by Ronald Duncan for the Peace Pledge Union, of which, as a pacifist, he had become an active member; the work was not a success and was soon withdrawn. The best known of his compositions from this period is probably Variations on a Theme of Frank Bridge for string orchestra, described by Matthews as the first of Britten's works to become a popular classic. It was a success in North America, with performances in Toronto, New York, Boston, Chicago and San Francisco, under conductors including John Barbirolli and Serge Koussevitzky. 
Question: What was the name of the company Britten became a member of?
answer:
GPO Film Unit.


question:
Passage: In the years following his recuperation from the heart attack, Bowie reduced his musical output, making only one-off appearances on stage and in the studio. He sang in a duet of his 1971 song "Changes" with Butterfly Boucher for the 2004 animated film Shrek 2.During a relatively quiet 2005, he recorded the vocals for the song "(She Can) Do That", co-written with Brian Transeau, for the film Stealth. He returned to the stage on 8 September 2005, appearing with Arcade Fire for the US nationally televised event Fashion Rocks, and performed with the Canadian band for the second time a week later during the CMJ Music Marathon. He contributed backing vocals on TV on the Radio's song "Province" for their album Return to Cookie Mountain, made a commercial with Snoop Dogg for XM Satellite Radio and joined with Lou Reed on Danish alt-rockers Kashmir's 2005 album No Balance Palace.Bowie was awarded the Grammy Lifetime Achievement Award on 8 February 2006. In April, he announced, "I'm taking a year off—no touring, no albums." He made a surprise guest appearance at David Gilmour's 29 May concert at the Royal Albert Hall in London. The event was recorded, and a selection of songs on which he had contributed joint vocals were subsequently released. He performed again in November, alongside Alicia Keys, at the Black Ball, a benefit event for Keep a Child Alive at the Hammerstein Ballroom in New York. The performance marked the last time Bowie performed his music on stage.Bowie was chosen to curate the 2007 High Line Festival, selecting musicians and artists for the Manhattan event, including electronic pop duo AIR, surrealist photographer Claude Cahun, and English comedian Ricky Gervais. Bowie performed on Scarlett Johansson's 2008 album of Tom Waits covers, Anywhere I Lay My Head. On the 40th anniversary of the July 1969 moon landing—and Bowie's accompanying commercial breakthrough with "Space Oddity"—EMI released the individual tracks from the original eight-track studio recording of the song, in a 2009 contest inviting members of the public to create a remix. A Reality Tour, a double album of live material from the 2003 concert tour, was released in January 2010.In late March 2011, Toy, Bowie's previously unreleased album from 2001, was leaked onto the internet, containing material used for Heathen and most of its single B-sides, as well as unheard new versions of his early back catalogue. 
Question: What was the name of the benefit that marked the last time Bowie performed his music on stage?
answer:

the Black Ball,.