Romilda Pantaleoni (1847 – 20 May 1917) was an Italian soprano who had a prolific opera career in Italy during the 1870s and 1880s.
 She sang a wide repertoire that encompassed bel canto roles, Italian and French grand opera, verismo operas, and the German operas of Richard Wagner.
 She became particularly associated with the roles of Margherita in Boito's "Mefistofele" and the title role in Ponchielli's "La Gioconda"; two roles which she performed in opera houses throughout Italy.
 She is best remembered today for originating the roles of Desdemona in Giuseppe Verdi's "Otello" (1887) and Tigrana in Giacomo Puccini's "Edgar" (1889).
 Universally admired for her acting skills as well as her singing abilities, Pantaleoni was compared by several critics to the great Italian stage actress Eleonora Duse.
Hard-Boiled Haggerty (aka Hard Boiled Haggerty) is a 1927 American silent war film directed by Charles Brabin.
 The film stars Milton Sills and Molly O'Day, taking on two roles as both the character Germaine and her look-alike sister.
 "Hard-Boiled Haggerty" was one of the first American films to portray aerial combat in World War I.
Andy Samuel Griffith (June 1, 1926 – July 3, 2012) was an American actor, television producer, Southern gospel singer, and writer.
 He was a Tony Award nominee for two roles, and gained prominence in the starring role in director Elia Kazan's film "A Face in the Crowd" (1957) before he became better known for his television roles, playing the lead roles of Andy Taylor in the sitcom "The Andy Griffith Show" (1960–1968) and Ben Matlock in the legal drama "Matlock" (1986–1995).
A judge–advisor system (JAS) is a type of advice structure often studied in advice taking research, a subset of decision-making in the social sciences.
 The two roles in a JAS are the judge and advisor roles.
 The judge is the decision maker who evaluates information concerning a particular decision and makes the final judgment on the decision outcome.
 The advisor is an individual who provides advice, information, or suggestions to the judge.
 A key component of the dynamics in a JAS is the differentiation between the two roles in that while the advisor provides input to the decision, actual decision-making power resides solely with the judge.
 This one person decision power differentiates the JAS and related models such as Hollenbeck's Hierarchical Decision-Making Team model from more widely studied models where the final decision is mutually decided upon by the team as a whole.
Stephen Joseph Malkmus (born May 30, 1966) is an American musician best known as the lead singer and guitarist of the indie rock band Pavement.
 He currently performs with Stephen Malkmus and the Jicks.
Dasavathaaram (English: "The Ten Incarnations" ) is a 2008 Indian Tamil science fiction disaster film, directed by K. S. Ravikumar.
 It stars Kamal Haasan, who also wrote the screenplay and story of the film, in ten distinct roles.The record of playing most number of roles in one Indian film was made by Sivaji Ganesan in "Navarathri" followed by the Telugu film with the same title and in Hindi as "Naya Din Nai Raat" (1974) with Sanjeev Kumar and Kamal Haasan in "Dasavathaaram" (2008).
 Asin appears in two roles and Mallika Sherawat plays a subsidiary role.
 The film, which had been under production for nearly three years, was produced and primarily distributed by Venu Ravichandran.
 Primary filming locations included the United States and across Tamil Nadu in India.
 The soundtrack to the film was composed by Himesh Reshammiya and the background score was by Devi Sri Prasad.
Tommy and Betty are two roles in rapper sword dance that represent the father and mother of the dancers.
 The Tommy and Betty often introduce the dance to the audience and seek to engage the audience.
 As with so many traditional dances in England and Europe, these characters are integral to the tradition, and their role was documented in all of the earliest published descriptions of the Northumbrian dance – descriptions which pre-date the introduction of the flexible rapper sword which so fundamentally changed the dance.
"Father to a Sister of Thought" is a song written by Stephen Malkmus of Pavement that appears on the band's third album, "Wowee Zowee" (1995).
 On June 20, 1995, the song was released as the second single from the album in 7" vinyl and CD-single formats; the track list is the same for both versions.
 Both B-sides are included amongst the bonus tracks on 2006's .
Parampara (meaning "the succession") is a 1990 Malayalam film directed by Sibi Malayil, written by S. N. Swamy, and starring Mammootty, Suresh Gopi, and Sumalatha.
 Mammootty plays two roles in the film, portraying both Johny, the protagonist, and Lawrence, his father.
Philip Voss (born 1936) is a British stage, radio, film and television actor.
 He has played small roles since the 1960s, but more notable ones include roles in such as the 1964 Doctor Who serial Marco Polo, Frankenstein and the Monster from Hell, the 1981 Lord of the Rings radio series, Indian Summer, an RSC 1996 revival of The White Devil, The Brides in the Bath, two plays in the Arkangel Shakespeare and a small role in an audio dramatisation of an Anton Chekov short story), until more recently attaining a recurring role in the TV series "Fish" as Ivan Vishnevski.
 Other credits include a stint at the London Shakespeare Workout, two roles for the Shared Experience Company (in Three Sisters and The Seagull), and playing Serebryakov in a West End rendition of Anton Chekov's "The Wood Daemon".

Question: What are the two roles of the writer of Father to a Sister of Thought?
Answer: lead singer and guitarist