Hayley Nichole Williams (born December 27, 1988) is an American singer, songwriter and musician.
 She serves as the lead vocalist, primary songwriter and occasional keyboardist of the rock band Paramore.
 The band was formed in 2004 by Josh Farro, Zac Farro, Jeremy Davis and Williams.
 The band consists of Hayley Williams, Zac Farro and Taylor York.
 The band has five studio albums: "All We Know Is Falling" (2005), "Riot!
" (2007), "Brand New Eyes" (2009), "Paramore" (2013) and "After Laughter" (2017).
In baseball, a cutter, or cut fastball, is a type of fastball which breaks slightly toward the pitcher's glove side as it reaches home plate.
 This pitch is somewhere between a slider and a fastball, as it is usually thrown faster than a slider but with more motion than a typical fastball.
 Some pitchers use a cutter as a way to prevent hitters from expecting their regular fastballs.
 A common technique used to throw a cutter is to use a four-seam fastball grip with the baseball set slightly off center in the hand.
 When a batter is able to hit a cutter pitch, it often results in soft contact and an easy out, due to the pitch's movement keeping the ball away from the bat's sweet spot.
 The cutter is typically 2–5 mph slower than a pitcher's four-seam fastball.
 In 2010, the average pitch classified as a cutter by PITCHf/x thrown by a right-handed pitcher was 88.6 mph; the average four-seamer was 92.1 mph.
Fastball is an American rock band that formed in Austin, Texas in 1995.
 The band originally called themselves "Magneto U.S.A." but changed their name after signing with Hollywood Records.
"The Only Exception" is a song by American rock band Paramore.
 It was released by Fueled by Ramen in February 2010 as the third single from the band's third studio album, "Brand New Eyes" (2009).
 The song was written by band members Hayley Williams and Josh Farro; Paramore is also credited as being co-producers to the song.
 The song was generally well received by music critics; praise of the song was mainly about Williams' vocal performance.
 Music critics reviewing the song noted that "The Only Exception" was a different musical theme for the band.
A changeup is a type of pitch in baseball and fastpitch softball.
 The changeup is the staple off-speed pitch, usually thrown to look like a fastball but arriving much more slowly to the plate.
 Its reduced speed coupled with its deceptive delivery is meant to confuse the batter's timing.
 It is meant to be thrown the same as a fastball, but farther back in the hand, which makes it release from the hand slower while still retaining the look of a fastball.
 A changeup is generally thrown to be 8–15 miles per hour slower than a fastball.
 If thrown correctly, the changeup will confuse the batter because the human eye cannot discern that the ball is coming significantly slower until it is around 30 feet from the plate.
 For example, a batter swinging at the ball as if it were a 90 mph fastball when it is coming in at 75 mph means he is swinging too early to hit the ball well, making the changeup very effective.
Hayley Williams (born June 3, 1990) is an American professional ice hockey player for the Brampton Thunder of the Canadian Women's Hockey League (CWHL).
 Williams has previously played for the Buffalo Beauts in the National Women's Hockey League (NWHL).
In baseball, the vulcan changeup pitch (otherwise known as a vulcan or trekkie) is a type of changeup; it closely resembles a forkball and split-finger fastball.
 It is a variation of the circle changeup, and when mastered can be extremely effective.
 Much like a forkball, the vulcan is gripped between two fingers on the hand, but rather than the middle and index finger as with the forkball or split-finger fastball, it sits in between the middle and ring fingers to make a v-shape (Vulcan salute) when releasing to the catcher.
 It is thrown with fastball arm speed but by pronating the hand by turning the thumb down, to get good downward movement on it.
Alexander Grant (born 27 August 1982), professionally known as Alex da Kid, is a British music producer from Wood Green, London.
 He has gained recognition for producing several hit singles for a plethora of artists in various music genres, such as Dr. Dre ("I Need a Doctor"), Nicki Minaj ("Massive Attack"), B.o.B ("Airplanes" featuring Hayley Williams), Eminem ("Love the Way You Lie" featuring Rihanna), Diddy ("Coming Home" with Dirty Money featuring Skylar Grey), Imagine Dragons ("Radioactive") and Cheryl ("Under The Sun").
"Stay the Night" is a song by Russian-German electronic dance music producer Zedd, from the deluxe edition (2013) of his debut studio album, "Clarity " (2012).
 It features vocals from Hayley Williams, the lead singer of American rock group Paramore.
 The song was written by Zedd, Williams, Benjamin Eli Hanna, and Carah Faye.
 "Stay the Night" was released to digital retailers on September 10, 2013, by Interscope Records as the lead single off the deluxe edition of "Clarity", and the fourth overall single from the album.
American rock band Paramore have recorded songs for five studio albums, a box set, an extended play and two soundtrack albums.
 In 2002, at age 13, vocalist Hayley Williams moved to Franklin, Tennessee, where she met brothers Josh Farro and Zac Farro.
 The band was officially formed by Josh Farro (lead guitar and backing vocals), Zac Farro (drums), Jeremy Davis (bass guitar) and Williams (lead vocals) in 2004, with the later addition of Williams' neighbor Jason Bynum (rhythm guitar).
 In 2005, Paramore signed with the New York City-based Fueled by Ramen and released their debut album entitled "All We Know Is Falling" that year.
 Three singles were released to promote the album.

Question: Hayley Williams and Fastball both perform what type of music?
Answer: American rock