Matthew Ryan is an American musician, singer and songwriter, born in Chester, PA and inspired by such artists as U2, The Replacements, and Leonard Cohen; he logged several years in a series of bands before signing with A&M Records as a solo artist in 1996.
 No Depression magazine has described him as, “"Equal parts Springsteen, Westerberg and Ryan Adams, Ryan is a powerhouse of a storyteller for almost two decades.
 A forefather of the Alt-country scene, Ryan has yet to receive as much commercial success as some of his contemporaries."”
 Ryan is known for his ”hushed rasp, with words catching like vows destined to be broken – one of modern music's most potent whispers."
Don Clark (born May 30, 1975) is an American musician.
 He was the rhythm guitarist and bassist for the Christian metal band, Demon Hunter, which he co-founded with his brother, vocalist Ryan Clark.
 Before Demon Hunter, Clark was a former guitarist and co-founder of Training for Utopia with Rob Dennler.
 He appears on Zao's "The Lesser Lights of Heaven" DVD.
Jaye Muller (born Jens Müller) is a German Internet entrepreneur and musician who performed under the name J., and later in a duo named "Muller & Patton" with American musician Ben Patton and under the name "Count Jaye" (2015).
 In 1992, he released his second solo album, "We Are the Majority".
 As of 1996, it had sold 350,000 copies worldwide.
 He later co-founded the telecommunications company JFAX, now j2 Global (NASDAQ:JCOM), which allowed its users to receive multiple types of media through their email.
 The company grew into a US$4 Billion+ business and is expanding constantly.
 Müller is no longer active in the company since 2004, but remained shareholder until 2016.
Lawrence McFarlane "Baldy" Northcott (September 7, 1908 – November 7, 1986) was a Canadian professional ice hockey left winger.
 Born in Calgary, Alberta, Northcott played ten seasons in the National Hockey League for the Montreal Maroons and Chicago Black Hawks.
Tom Northcott (born August 29, 1943 in Vancouver, British Columbia, Canada) is a Canadian folk-rock singer with hits in the late 1960s and early 1970s.
 He became known to a Canadian audience by his regular appearances on CBC Television's "Let's Go" music program in 1964-68.
 He was nominated as best male vocalist for a Juno Award in 1971.
 Later he co-founded Mushroom Studios in Vancouver and produced records.
 His hits are played regularly on Canadian classic rock radio stations.
John Strohm (or John P. Strohm, born March 23, 1967 in Bloomington, Indiana) is an American musician, singer, and lawyer.
 He began his musical career playing drum set in Indiana's punk rock scene, then moved to Boston in 1985 and switched to guitar.
 With Juliana Hatfield and Freda Love (then Freda Boner) he co-founded the indie rock trio Blake Babies in 1986.
 In 1994 the band Velo-Deluxe with Strohm as the frontman released their only album "Superelastic" through Mammoth Records.
 Strohm also played drums in The Lemonheads from 1987 - 1989 and guitar during the years 1993-1994 and 1996-1997.
 He led the indie rock band Antenna and released his first solo album, "Vestavia", in 1999.
 In 2007 Strohm released another full-length album, "Everyday Life".
Frank Navetta (March 6, 1962 – October 31, 2008) was an American musician who was the original guitarist of the punk rock band the Descendents, which he co-founded.
 He formed the band in Manhattan Beach, California with Dave Nolte in the late 1970s and played on their 1979 debut single, the "Fat EP" (1981), and their first album, "Milo Goes to College" (1982).
 Navetta then quit the band and moved to Oregon to become a fisherman.
 He collaborated with the Descendents again on the 1996 album "Everything Sucks", and prior to his death in 2008 had been working on new material with original Descendents members Bill Stevenson and Tony Lombardo.
Ryan Northcott (born April 9, 1980) is a Canadian actor, in the film "Mystery, Alaska", "Ripper (film)", and played "Carl Wilson" in the Emmy nominated miniseries "".
 He is currently CEO & Founder of MEDIAPOP Creative and OwlBox Construction Time-Lapse and continues to appear in TV & Film.
Ryan Steelberg is an American serial entrepreneur and investor who co-founded AdForce (IPO), 2CAN Media (Sold to CMGi), and dMarc Broadcasting (Sold to Google).
 Most recently, Ryan Steelberg co-founded Veritone, Inc. (NASDAQ: VERI) along with his brother, Chad Steelberg, and serves as its President and on its Board of Directors."
Carl Dean Wilson (December 21, 1946 – February 6, 1998) was an American musician, singer, songwriter, and record producer who co-founded the Beach Boys.
 He is best remembered as their lead guitarist and as the youngest brother of bandmates Brian and Dennis Wilson.

Question: Ryan Northcott played an American musician who co-founded what?
Answer: the Beach Boys