Underground is the fifth solo album by English rock singer Graham Bonnet, originally released in 1997.
 "Underground" reunites Bonnet with guitarist Danny Johnson, who previously performed with Bonnet in Alcatrazz.
 "Lost in Hollywood" is a re-recording of a song Bonnet recorded during his tenure with Rainbow.
Forrest Scott Kline (born November 7, 1983, in Ashland, Oregon) is an American musician, songwriter, lead singer, and guitarist.
 He is a member of the power pop band Hellogoodbye.
Zombies!
 Aliens!
 Vampires!
 Dinosaurs!
 is the debut studio album by American indie pop band Hellogoodbye.
 Produced by Matt Mahaffey, Jeff Turzo, and Forrest Kline, the album was released on August 8, 2006 in the United States by Drive-Thru Records.
 The album's lead single, "Here (In Your Arms)", reached number 14 on the "Billboard" Hot 100 and was certified platinum in the United States.
The Day I Went Mad is the sixth solo album by English rock singer Graham Bonnet, originally released in 1999.
 Much like his previous solo efforts, Bonnet enlisted a host of guest musicians for the recording, including former Guns N' Roses guitarist Slash, Def Leppard guitarist Vivian Campbell and Vanilla Fudge bassist Tim Bogert.
 The album cover was illustrated by guitarist Mario Parga, who plays on several tracks.
Would It Kill You?
 is the second studio album by Hellogoodbye.
 It was released November 9, 2010.
 "When We First Met" was the album's lead single, and it was released for free download on September 5, 2009.
 The album was produced by Forrest Kline, the frontman for the group.
Graham Bonnet (born 23 December 1947) is an English rock singer and songwriter.
 He has recorded and performed as a solo artist and as a member of several hard rock and heavy metal bands including Rainbow, the Michael Schenker Group, Alcatrazz, and Impellitteri.
 Bonnet is known for his James Dean-inspired style and extremely powerful singing voice and wide vocal range.
 His singing has been noted as 'very loud' by both his contemporaries and himself, and he claims to be a self-taught singer with 'no discipline for lessons'.
Assault Attack is the third studio album from The Michael Schenker Group, and the only album to feature former Rainbow vocalist Graham Bonnet.
 The album was recorded in France at the Château d'Hérouville and was produced by Martin Birch.
Hellogoodbye (sometimes styled as hellogoodbye) is a pop rock band that was formed in Huntington Beach, California in 2001 by singer Forrest Kline.
 They were signed to Drive-Thru Records and released their first full-length album "Zombies!
 Aliens!
 Vampires!
 Dinosaurs!
" in 2006, in addition to their previously released EP "Hellogoodbye" and DVD "OMG HGB DVD ROTFL".
 In 2010, the band released "Would It Kill You?
" on their label Wasted Summer Records.
 The album was released in the United Kingdom and Europe by LAB Records on the 14 March 2011.
 Hellogoodbye released their third album, Everything is Debatable, on October 29, 2013, while touring as the opening act for Paramore's The Self-Titled Tour.
Hellogoodbye is the eponymous debut EP from Hellogoodbye.
 It was released on August 17, 2004 by Drive-Thru Records.
 All the vocals and instruments were recorded solely by Forrest Kline, except for the lead vocals on track 4, which were performed by Jesse Kurvink.
Alcatrazz was an American heavy metal band formed in 1983 by Graham Bonnet, Jimmy Waldo and Gary Shea.
 They are best known for their songs "Island in the Sun" and "God Blessed Video".

Question: What do Graham Bonnet and Forrest Kline have in common?
Answer: songwriter