Question: What plot follows Barden University's all-girl a cappella group, The Barden Bellas, as they compete against another a cappella group from their college to win Nationals, and starred an actress known for her role of Alexis in the party film "Project X"?

Context articles: Pitch Perfect (soundtrack)
Night Owls (vocal group)
Emocapella
Alexis Knapp
Smiffenpoofs
Pitch Perfect
Stanford Mendicants
The Brown Derbies
Northwestern THUNK a cappella
Pitch Perfect 2

Pitch Perfect: Original Motion Picture Soundtrack is the official music for the 2012 film "Pitch Perfect".
 The soundtrack was released digitally on September 25, 2012, and physically on October 2, 2012.
 Three songs from the album charted on the "Billboard" Hot 100: "Cups" by Anna Kendrick, which peaked at number 6; "Bellas Finals: Price Tag/Don't You (Forget About Me)/Give Me Everything/Just the Way You Are/Party in the U.S.A./Turn the Beat Around" by The Barden Bellas, which peaked at number 85; and "Riff Off: Mickey/Like a Virgin/Hit Me with Your Best Shot/S&M/Let's Talk About Sex/I'll Make Love to You/Feels Like the First Time/No Diggity" by The Barden Bellas, The Treblemakers, and the BU Harmonics, which has peaked at number 86.
The Night Owls (also known as the "Owls") are the oldest continuous all-female a cappella group in the United States and are Vassar College's oldest a cappella group.
 The Night Owls are an all-female jazz a cappella group that performs a range of music from jazz standards to current pop hits to indie-folk music.
Emocapella (a portmanteau of emo and a cappella) is a collegiate a cappella group at the George Washington University, formerly all-male but co-ed since 2010.
 Emocapella was founded in October 2001 by Eric Denman and Dan Riesser, GW sophomores at the time, who wanted to form a group that purposefully deviated from traditional a cappella.
 The group's first performance was in December 2001, opening for another GW a cappella group, the Vibes.
 They were invited by Taking Back Sunday in December 2002 to perform at their opening act.
Alexis Merizalde Knapp (born July 31, 1989) is an American actress and singer.
 She is known for her role as Stacie Conrad in the musical films "Pitch Perfect" (2012) , "Pitch Perfect 2" (2015) and the upcoming "Pitch Perfect 3".
 She is also known for her role of Alexis in the party film "Project X" (2012), and her role on the first season of the TBS comedy "Ground Floor".
Formed in 1936 at Smith College, the Smiffenpoofs are the oldest traditionally all-female collegiate a cappella group in the United States.
 The group's founding came shortly after a group of Smithies attended a picnic with students from their brother school, Yale University, in Northampton, Massachusetts, where the Yale Whiffenpoofs performed.
 Inspired by this male a cappella group, a few ambitious Smithies returned to school determined to establish their own a cappella group.
 In honor of the Whiffenpoofs, they adopted a similar name.
Pitch Perfect is a 2012 American musical comedy film written by Kay Cannon and directed by Jason Moore.
 It features an ensemble cast, including Anna Kendrick, Skylar Astin, Rebel Wilson, Anna Camp, Brittany Snow, Ester Dean, Alexis Knapp, Hana Mae Lee, Adam DeVine, Ben Platt, John Michael Higgins, and Elizabeth Banks.
 The plot follows Barden University's all-girl a cappella group, The Barden Bellas, as they compete against another a cappella group from their college to win Nationals.
 The film is loosely adapted from Mickey Rapkin's non-fiction book, titled "Pitch Perfect: The Quest for Collegiate a Cappella Glory".
 Filming concluded in December 2011, in Baton Rouge, Louisiana.
The Stanford Mendicants are an all-male a cappella group at Stanford University.
 The group is Stanford University's original a cappella group.
 Since its founding in 1963, the group's size has varied from 6 to 19 members.
 Although they are strictly an a cappella group today, they have performed with instruments in previous generations.
 The group prides itself on singing a wide range of songs, from gospel to barbershop to pop tunes and original compositions.
 The Mendicants are known around Stanford's campus for their romantic serenades.
The Brown Derbies is an all-male a cappella group at Brown University.
 They were founded by Darryl Shrock in 1982 and have released twelve albums.
 They sing a variety of different genres, ranging from Rock, to Barbershop, to R&B and are known in the a cappella community for their unique use of syllables in the background vocals.
 They have toured all around the United States and the globe, and even sang at the White House.
 In November 2007, they were featured on the CBS Early Show on a segment about the rising popularity of a cappella groups on college campuses, and in July 2011 they were featured on the Gospel Music Channel reality show America Sings.
 In January 2012, they performed in the London A Cappella Festival.
 They are known for building humor and choreography into many of their live performances.
 An annual tradition is performing with the Chattertocks in their annual concert, "Smoked Salomon," which occurs every September in Salomon Hall on the Brown University campus.
 Their sister a cappella group is the Smith Smiffenpoofs.
THUNK a cappella is a 16-member co-ed collegiate a cappella group from Northwestern University in Evanston, Illinois.
 Founded in 1993, the group was originally called Melodious Thunk, created after the giant in American jazz music, Thelonious Monk, but the name was changed simply to THUNK because of legal formalities.
 THUNK is Northwestern University's oldest a cappella group on campus.
 International Championship of Collegiate A Cappella (ICCA) award-winners, and regularly featured on various a cappella media like the InsideAcappella video blogs and The A Cappella Blog, THUNK is entirely student directed and produced.
 They have two to three shows each year and travel to Cape Town, South Africa every other year to provide music therapy and musical education outreach programs.
 In addition to on-campus performances each year, THUNK performs at major events in the Chicago area.
 Some of THUNK’s notable performance venues include Northwestern University’s President’s Convocation, Wrigley Field, Westminster Abbey in London, England, The Museum of Contemporary Art in Chicago, the Royal National Theatre in London, England, and the Amphitheater at the Victoria & Alfred Waterfront in Cape Town.
Pitch Perfect 2 is a 2015 American musical comedy film directed and co-produced by Elizabeth Banks and written by Kay Cannon.
 It is a sequel to the 2012 film "Pitch Perfect" and the second installment in the "Pitch Perfect" series.
 The film centers on the fictional Barden University and The Bellas, an all-female a cappella singing group.
 The film features an ensemble cast, including Anna Kendrick, Rebel Wilson, Hailee Steinfeld, Brittany Snow, Alexis Knapp, Hana Mae Lee, Ester Dean, Chrissie Fit, Kelley Jakle and Shelley Regner as The Bellas.
 It was released on May 15, 2015 by Universal Pictures.