Some context: Ai Otsuka (Da Zhong  Ai , Otsuka Ai, born September 9, 1982) is a Japanese singer-songwriter from Suminoe-ku, Osaka, Japan. She is a popular artist on the Avex Trax label and is best known for her 2003 hit "Sakuranbo," which stayed in the Top 200 Oricon Weekly Singles Chart for 103 weeks. A piano player since age four, Otsuka composes and co-produces her own songs, as well as writes her own lyrics. Her music ranges from upbeat pop/rock music to ballads.
In November 2004, the follow-up to Love Punch, Love Jam, was released, which met even greater popular success. Along with three single released before her second studio album was released. First, "Happy Days" sold 163,433 units and reached third on the Oricon weekly chart. Love Jam Tour 2005, her first tour, began on April 24, 2005. It was completed in June 2005 and a live DVD with footage was released on July 27, 2005. Love Cook, her third album was released on December 14, 2005.  "Kingyo Hanabi" was the second single to be released after her first album. "Kingyo Hanabi" also landed in third on the Oricon weekly chart but was able to sell 148,121 units, about 20,000 copies less than her "Happy Days" single. Two months later, Otsuka released another single, "Daisuki da Yo". Like the previous two singles, it reached number 3 on the Oricon weekly chart and sold 156,844 units.  Otsuka released her second studio album a month later in November 2004. Love Jam debuted at the number one position and sold 224,381 units in its first week. In total, 656,700 units were sold. Love Jam became her first album to top the chart, but at the same time it was her lowest selling studio album. Love Jam was released in two different versions including a CD and a CD+DVD version. Following the release of Love Jam, Ai Otsuka released the recut single "Kuroge Wagyu Joshio Tan Yaki 680 Yen" in February 2005. It was a different version of the "Kuroge Wagyu Joshio Tan Yaki 735 Yen" track on Love Jam. "Kuroge Wagyu Joshio Tan Yaki 680 Yen" is arranged differently in terms of music and vocals. This single sold 149,134 units and debuted third on the Oricon weekly chart and was the sixty-eighth single of 2005. It was the first ending theme song for the anime Black Jack.
What was a popular single off the album?
A: Happy Days

Some context: Pierrot (French pronunciation:  [pjeRo]) is a stock character of pantomime and commedia dell'arte whose origins are in the late seventeenth-century Italian troupe of players performing in Paris and known as the Comedie-Italienne; the name is a diminutive of Pierre (Peter), via the suffix -ot. His character in contemporary popular culture--in poetry, fiction, and the visual arts, as well as works for the stage, screen, and concert hall--is that of the sad clown, pining for love of Columbine, who usually breaks his heart and leaves him for Harlequin. Performing unmasked, with a whitened face, he wears a loose white blouse with large buttons and wide white pantaloons. Sometimes he appears with a frilled collaret and a hat, usually with a close-fitting crown and wide round brim, more rarely with a conical shape like a dunce's cap.
In 1842, Deburau was inadvertently responsible for translating Pierrot into the realm of tragic myth, heralding the isolated and doomed figure--often the fin-de-siecle artist's alter-ego--of Decadent, Symbolist, and early Modernist art and literature. In that year, Gautier, drawing upon Deburau's newly acquired audacity as a Pierrot, as well as upon the Romantics' store of Shakespearean plots and of Don-Juanesque legend, published a "review" of a pantomime he claimed to have seen at the Funambules.  He entitled it "Shakespeare at the Funambules", and in it he summarized and analyzed an unnamed pantomime of unusually somber events: Pierrot murders an old-clothes man for garments to court a duchess, then is skewered in turn by the sword with which he stabbed the peddler when the latter's ghost lures him into a dance at his wedding. The pantomime under "review" was a fabrication (though it inspired a hack to turn it into an actual pantomime, The Ol' Clo's Man [1842], in which Deburau probably appeared--and also inspired Barrault's wonderful recreation of it in Children of Paradise). But it importantly marked a turning-point in Pierrot's career: henceforth Pierrot could bear comparisons with the serious over-reachers of high literature, like Don Juan or Macbeth; he could be a victim--even unto death--of his own cruelty and daring.  When Gustave Courbet drew a crayon illustration for The Black Arm (1856), a pantomime by Fernand Desnoyers written for another mime, Paul Legrand (see next section), the Pierrot who quakes with fear as a black arm snakes up from the ground before him is clearly a child of the Pierrot in The Ol' Clo's Man. So, too, are Honore Daumier's Pierrots: creatures often suffering a harrowing anguish. In 1860, Deburau was directly credited with inspiring such anguish, when, in a novella called Pierrot by Henri Riviere, the mime-protagonist blames his real-life murder of a treacherous Harlequin on Baptiste's "sinister" cruelties. Among the most celebrated of pantomimes in the latter part of the century would appear sensitive moon-mad souls duped into criminality--usually by love of a fickle Columbine--and so inevitably marked for destruction (Paul Margueritte's Pierrot, Murderer of His Wife [1881]; the mime Severin's Poor Pierrot [1891]; Catulle Mendes' Ol' Clo's Man [1896], modeled on Gautier's "review").
What role did Pierrot play in Shakespeare at the Funambules?
A:
Pierrot murders an old-clothes man for garments