Question: Are Joe Walsh and Mark Hoppus both songwriters as well as vocalists in their various bands?

Context articles: James M. Ingram
Greatest Hits (Blink-182 album)
Commit This to Memory
My Dinosaur Life
Joe Walsh's Greatest Hits – Little Did He Know...
Buddha (album)
Mark Hoppus
Hoppus on Music
The Confessor (song)
Joe Walsh

James M. Ingram is an American Recording Engineer based in Los Angeles, California.
 He first started working with Blink 182 members Mark Hoppus, and Travis Barker, at their studio in Los Angeles during the recording of the +44 album When Your Heart Stops Beating.
 During this time he also appeared as a frequent guest on Hoppus' podcast, "Hi My Name is Mark."
 Hoppus notes during podcast number 6, that this James Ingram is not to be confused with "THE James Ingram", the popular American soul musician.
Greatest Hits is the first greatest hits album of American rock band Blink-182.
 It was released on October 31, 2005 by Geffen Records.
 "Greatest Hits" was created by Geffen shortly after the band's February 2005 breakup, termed an "indefinite hiatus" by the label.
 Tensions had risen in the group and guitarist Tom DeLonge desired to take time off.
 Bassist Mark Hoppus and Travis Barker argued with DeLonge regarding the band's future and their possible next album, and heated exchanges led to DeLonge's exit.
 In the interim, Hoppus and Barker continued playing together in +44, and DeLonge formed his new outfit Angels & Airwaves.
Commit This to Memory is the second studio album by American rock band Motion City Soundtrack.
 Produced by Mark Hoppus, the album was released on June 7, 2005, in the United States by Epitaph Records.
 Motion City Soundtrack, formed in 1997, had first found success with their debut album, "I Am the Movie" (2002).
 The band toured in the interim years, creating positive word-of-mouth.
 In 2004, the band joined Blink-182 on the road for a string of shows, which led to their bassist, Mark Hoppus, joining the band in the studio for his first producing effort.
My Dinosaur Life is the fourth studio album by the American rock band Motion City Soundtrack.
 Produced by Mark Hoppus, the album was released on January 19, 2010 by Columbia Records.
 After many years on independent label Epitaph Records, Motion City Soundtrack signed to major label Columbia in 2006, prior to the release of their third album, "Even If It Kills Me" (2007).
 Blink-182 bassist Mark Hoppus returned to produce the album; he had previously worked with the band on their 2005 breakthrough "Commit This to Memory".
Joe Walsh's Greatest Hits – Little Did He Know... is the fourth compilation released by guitarist Joe Walsh.
 It contains his best-known solo songs as well as those he recorded with the James Gang and Barnstorm, but it does not contain material he released as a member of the Eagles.
 The remastered reissue of the compilation "Joe Walsh: The Definitive Collection" (2006) has the same cover art except for differing text above the photo and no text below the photo.
Buddha is the third and final demo by the American rock band Blink-182.
 Recorded and released in January 1994 under the name Blink, it was the band's first recording to be sold and distributed.
 Blink-182 was formed in Poway, California, a suburb outside of San Diego, in August 1992.
 Guitarist Tom DeLonge and Mark Hoppus were introduced to one another by Hoppus' sister.
 The duo recruited drummer Scott Raynor and began to practice together in his bedroom, spending hours together writing music, attending punk shows and movies and playing practical jokes.
 The band had recorded two previous demos in Raynor's bedroom — "Flyswatter" and "Demo No.2" — using a four track recorder.
 Most of the tracks from the demo were re-recorded for their debut album "Cheshire Cat".
Mark Allan Hoppus (born March 15, 1972) is an American musician, singer, songwriter, record producer, and television personality best known as the bassist and co-lead vocalist for the pop punk band Blink-182.
Hoppus On Music, previously titled A Different Spin with Mark Hoppus, is a talk show hosted by Blink-182 and +44 singer/bassist Mark Hoppus.
 The show premiered on September 16, 2010, on Fuse, and lasted until June 2012.
 The show formerly featured comedian Amy Schumer as the co-host.
"The Confessor" is a song by Joe Walsh that appeared on his 1985 album of the same name.
 It is the longest song on the album clocking in at 7 minutes and 6 seconds, and it has two segments.
 The first segment is a slow acoustic intro, and Joe Walsh sings an introductory verse before the second segment, which is hard rock.
 After the slow introduction, the drums kick in, and Joe Walsh sings a couple more verses before the instrumental bridge section, where he plays his solos and riffs. Although the song failed to chart on the Billboard Hot 100, it did manage to reach #8 on the Hot Mainstream Rock Tracks chart.
Joseph Fidler Walsh (born November 20, 1947) is an American singer, guitarist, and songwriter.
 In a career spanning more than 40 years, he has been a member of five successful rock bands: James Gang, Barnstorm, Eagles, the Party Boys, and Ringo Starr & His All-Starr Band.
 In the 1990s, he was also a member of the short-lived supergroup the Best.