Question: What guest musician that was featured in Derek Sherinian's albums won the "Best Rock Bass Player" readers' poll from "Guitar Player" magazine five times for his "lead bass" playing style?

Context articles: Billy Sheehan
Hittin' the Note
Steve Vai discography
Derek Sherinian
Brett Garsed
Zachary Throne
Black Utopia
Mythology (Derek Sherinian album)
Victims (band)
Brian Helicopter

William "Billy" Sheehan (born March 19, 1953), is an American bassist known for his work with Talas, Steve Vai, David Lee Roth, Mr. Big, Niacin, and The Winery Dogs.
 Sheehan has won the "Best Rock Bass Player" readers' poll from "Guitar Player" magazine five times for his "lead bass" playing style.
 Sheehan's repertoire includes the use of chording, two-handed tapping, right-hand "three-finger picking" technique and controlled feedback.
Hittin' the Note is the twelfth and final studio album by the American Southern rock group the Allman Brothers Band.
 Released through Sanctuary Records, it was their first studio album to include lead slide guitar player Derek Trucks and bass player Oteil Burbridge and marked the full-time return of guitar player Warren Haynes to the band.
 It was also their first (and only) studio album not to include original guitarist Dickey Betts.
Steve Vai is an American guitar player, songwriter and producer.
 He started his career in 1980 playing with Frank Zappa and has since recorded and toured with Alcatrazz, Whitesnake, David Lee Roth and Public Image Ltd.
 Since 1983 Vai also released his own studio albums. His discography consists of eight studio albums, two EPs, two special albums, eight live albums, twelve soundtracks, twenty compilation albums and seven videos. Vai has been awarded three Grammy Awards and forty other awards.
 Vai also appeared as a guest musician on forty-four albums, playing with artists like Alice Cooper, Ozzy Osbourne and Gregg Bissonette and most recently for the second time with Joe Jackson.
Derek Sherinian (born August 25, 1966) is an American keyboardist who has toured and recorded for Alice Cooper, Billy Idol, Yngwie Malmsteen, Kiss, Steve Vai, and Joe Bonamassa.
 He was also a member of Dream Theater from 1994–99, is the founder of Planet X and also one of the founding members of Black Country Communion and Sons of Apollo.
 He has released seven solo albums that have featured a variety of prominent guest musicians, including guitarists Slash, Yngwie Malmsteen, Allan Holdsworth, Steve Lukather, Joe Bonamassa, Billy Sheehan, Zakk Wylde and Al Di Meola.
Brett Edward Garsed (born 20 April 1963) is an Australian musician and songwriter, best known for his work as a guitarist with John Farnham and T. J. Helmerich, as well as being a former member of the American band Nelson.
 Garsed was featured on Derek Sherinian's solo records "Planet X" (1999) and Planet X's "Quantum" (2007), and more recently Sherinian's "Molecular Heinosity" (2010).
Zachary Throne (born April 3, 1967 in Hollywood, California) is an American actor and musician who has appeared in a wide number of television, film and stage productions and on numerous rock, pop and soundtrack albums.
 Throne is a self-taught, musician who sings, plays guitar, bass, drums, and piano – and is self-taught on all instruments.
 He is the son of Malachi Throne and Judith Merians and is the brother of Joshua Throne.
 He earned a Gold record in 1992 for his work on the soundtrack album to the television series "The Heights", on which he performed guitars, bass, piano and vocals as well as co-starred in the series.
 The album yielded a hit single, "How Do You Talk To An Angel" (on which Zachary performed on) that was #1 on "Billboard" for two weeks in November 1992.
 As an actor, Zachary is best known for playing the recurring role of "Howard", the radio station manager/drug dealer on "Beverly Hills 90210" and for playing "Danny" on the FOX series, "Party Of Five".
 As a singer, Zachary has sung on many TV and radio jingles.
 He provided the singing voice for the character, "Mark Winkle" on the television series, "California Dreams" as well as the singing voice for the character, "Greg Brady" in the films, "The Brady Bunch Movie" and "A Very Brady Sequel".
 Currently, he resides in Las Vegas, Nevada where he performs in many shows.
 From 2012-2014, he was the lead singer/lead guitar player/bass player for the Sin City Sinners, a group that also featured former Faster Pussycat guitarist and co-founder Brent Muscat as well as Slash bass player, Todd Kerns.
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 With the group, he recorded two albums, "DIVEBAR Days Revisited" and "A Sinners Christmas 2", both released in 2013.
Black Utopia is the third solo album by keyboard player Derek Sherinian.
 In addition to the returning members Zakk Wylde, Simon Phillips and Steve Lukather, three new musicians joined Sherinian: bass guitarist Billy Sheehan and guitarists Yngwie Malmsteen – with whom Sherinian had toured in 2001 – and Al Di Meola.
 "One of the highlights of my career was flying to Miami to produce Yngwie, and the next day Al Di Meola - all for my record!"
 The song "Axis Of Evil", (co-written with KISS drummer Eric Singer), has Zakk Wylde and Yngwie Malmsteen in a guitar duel.
 "Black Utopia" was the beginning of an ongoing collaboration with drummer Brian Tichy, and album cover artist Mattias Noren.
 "Black Utopia" is Sherinian's best selling solo record to date.
Mythology is the fourth solo album by keyboard player Derek Sherinian.
 Sherinian again draws upon some of the greatest talent from the worlds of rock and jazz music.
 Among the artists appearing on "Mythology" are jazz fusion player Allan Holdsworth (U.K., Soft Machine, Level 42), Steve Lukather (Toto), Simon Phillips (Toto, Jeff Beck, The Who), Zakk Wylde (Ozzy Osbourne, Black Label Society), Grammy award winner Steve Stevens (Billy Idol), Jerry Goodman (Mahavishnu Orchestra, Dixie Dregs), and a very rare guest appearance from guitarist John Sykes (Whitesnake, Thin Lizzy, Blue Murder).
Victims are a Swedish hardcore punk band, originally hailing from Nyköping, they are currently based in Stockholm.
 The current line-up consists of lead vocalist and bass player Johan Eriksson, drummer Andy Henriksson, guitar player and vocalist Jon Lindqvist and guitar player Gareth Smith.
 Through their career, the band has released five studio albums, two EPs and three split albums.
Brian Helicopter is the stage name of Gareth Holder (born 27 June 1958, Leamington Spa), an English musician, based in the United States.
 He is best known for playing bass guitar for the UK punk rock band The Shapes.
 He also played for many other bands, the most notable being the NWOBHM bands Rogue Male and HellsBelles.
 For a short time in the early 1980s, he was also a member of British R&B band The Mosquitos, with guitarist Steve Walwyn of Dr. Feelgood and Eddie and the Hot Rods, and can be seen on the cover of The Mosquitos only single "Somethin' Outta Nothin'".
 A prolific session player, he appears both credited and uncreditied on many releases throughout the 1980s and early 1990s under both his real and stage name.
 He was one of the first bassists in the nascent UK punk scene to adopt the Rickenbacker bass guitar which he still uses to this day.
 He was also one of the first bass guitarists in the world to use Trace Elliot amplification.
 His bass playing style is characterized by a very fast precise pick attack, and fast runs.
 Unusually for a bass guitarist, he sometimes utilizes an overhand tapping technique more common to six string players.
 He continues to play professionally, reverting between his real name and his stage name as the fancy takes him.
 He is also a professional skydiving coach and instructor, currently holding seven world records in the sport.
 He can be seen in an episode of MythBusters aired on the Discovery Channel taking presenter Kari Byron skydiving whilst testing the falling airplane blue ice myth.
 He is also a vegetarian.
 He can be seen in the independent film Six Sex Scenes and a Murder, in the role of the bounty hunter.
 He currently resides in California, where he plays bass for the San Francisco Bay Area band Ghosthookers.
 Ghosthookers released a record in 2008 which features Brian Helicopter on bass under his real name.