This is the Megadeth Complete Discography.  It contains a complete discography and videography, including song titles and the composers.  The next two Complete Discography pages are for Iron Maiden and Metallica, respectively.
 

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Megadeth Discography
Megadeth Videography
 

Megadeth

     Megadeth began when Metallica’s lead guitarist Dave Mustaine was fired for his excessive drinking habits.  He hooked up with bassist David Ellefson to form Megadeth in 1984.  Megadeth has gone through several line-up changes.  The most recent (and best), after the two Daves finally got off drugs, was adding drummer Nick Menza and soloist Adam Martin (Marty) Friedman between their third and fourth albums.  They have released 6 albums and most recently an E.P. of songs they did for soundtracks, compilations, and tribute albums.  For more info on Megadeth, visit Megadeth, Arizona, the Megadeth CyberArmy Web Site, and the Megadeth Newsgroup.
 

Megadeth -- Original lineup

• Dave Mustaine:  (Lead and) Rhythm Guitars, Vocals
• David Ellefson:  Bass, Backup Vocals
• Kerry King (Slayer):  Lead (and Rhythm) Guitars
• Lee Rash:  Drums

• Dave Mustaine:  (Lead and) Rhythm Guitars, Vocals (Piano on Killing Is My Business…)
• David Ellefson:  Bass, Backup Vocals
• Chris Poland:  Lead (and Rhythm) Guitars
• Gar Samuelson:  Drums (Tympani on “Rattlehead” on Killing Is My Business… Cigarette Burns on Peace Sells…)

• Dave Mustaine:  Lead Vocals, (Lead,) Rhythm, and Acoustic Guitars
• David Ellefson:  Bass Guitars and Backup Vocals
• Jeff Young:  Lead, (Rhythm,) and Acoustic Guitars
• Chuck Behler:  Drums and Percussion

• Dave Mustaine:  (Lead and) Rhythm Guitars, Vocals (Piano on Killing Is My Business…)
• David Ellefson:  Bass, Backup Vocals
• Nick Menza:  Drums

• Dave Mustaine:  (Lead and) Rhythm Guitar, Lead Vocals
• David Ellefson:  Bass and Backing Vocals
• Marty Friedman:  Lead (and Rhythm) Guitar (Acoustic Guitar on Countdown) and Backing Vocals (except on Rust In Peace)
• Nick Menza:  Drums and Backing Vocals

Megadeth Discography

Killing Is My Business… And Business Is Good! (1985 Combat Records) Produced by Dave Mustaine and Karat Faye

1. Last Rites/Loved to Death (Mustaine)
2. Killing Is My Business… And Business Is Good! (Mustaine)
3. The Skull Beneath the Skin (Mustaine)
4. These Boots (Lee Hazelwood, Mustaine)
5. Rattlehead (Mustaine)
6. Chosen Ones (Mustaine)
7. Looking Down the Cross (Mustaine)
8. Mechanix (Mustaine)

1. Wake Up Dead (Mustaine)
2. The Conjuring (Mustaine)
3. Peace Sells (Mustaine)
4. Devil's Island (Mustaine)
5. Good Mourning/Black Friday (Mustaine)
6. Bad Omen (Mustaine)
7. I Ain’t Superstitious (Willie Dixon)
8. My Last Words (Mustaine)

1. Into the Lungs of Hell (Instrumental) (Mustaine)
2. Set the World Afire (Music & Lyrics by Mustaine)
3. Anarchy In The U.K. [Song by Glen Matlock, Johnny Rotten, Paul Cook, and Steve Jones (The Sex Pistols)]
4. Mary Jane (Music by Mustaine, Lyrics by Mustaine & Ellefson)
5. 502 (Music & Lyrics by Mustaine)
6. In My Darkest Hour (Music by Mustaine, Lyrics by Mustaine & Ellefson)
7. Liar (Music by Mustaine & Ellefson, Lyrics by Mustaine)
8. Hook In Mouth (Music by Mustaine & Ellefson, Lyrics by Mustaine)

1. Holy Wars… The Punishment Due (Mustaine)
2. Hangar 18 (Mustaine)
3. Take No Prisoners (Mustaine)
4. Five Magics (Mustaine)
5. Poison Was The Cure (Mustaine)
6. Lucretia (Mustaine, Ellefson)
7. Tornado of Souls (Mustaine, Ellefson)
8. Dawn Patrol (Mustaine, Ellefson)
9. Rust In Peace… Polaris (Mustaine)

1. Skin O’ My Teeth (Mustaine)
2. Symphony Of Destruction (Mustaine)
3. Architecture Of Aggression (Mustaine, Ellefson)
4. Foreclosure of a Dream (Mustaine, Ellefson)
5. Sweating Bullets (Mustaine)
6. This Was My Life (Mustaine)
7. Countdown to Extinction (Mustaine, Menza, Ellefson, Friedman)
8. High Speed Dirt (Mustaine, Ellefson)
9. Psychotron (Mustaine)
10. Captive Honour (Mustaine, Ellefson, Menza, Friedman)
11. Ashes In Your Mouth (Mustaine, Menza, Ellefson, Friedman)

1. Reckoning Day (Music by Mustaine & Friedman; Lyrics by Mustaine & Ellefson)
2. Train of Consequences (Music & Lyrics by Mustaine)
3. Addicted to Chaos (Music & Lyrics by Mustaine)
4. A Tout Le Monde (Music & Lyrics by Mustaine)
5. Elysian Fields (Music by Mustaine; Lyrics by Mustaine & Ellefson)
6. The Killing Road (Music & Lyrics by Mustaine)
7. Blood of Heroes (Music & Lyrics by Mustaine)
8. Family Tree (Music by Mustaine, Ellefson, & Menza; Lyrics by Mustaine)
9. Youthanasia (Music & Lyrics by Mustaine)
10. I Thought I Knew It All (Music by Mustaine, Ellefson, Friedman, & Menza; Lyrics by Ellefson & Mustaine)
11. Black Curtains (Music by Mustaine & Friedman; Lyrics by Mustaine)
12. Victory (Music & Lyrics by Mustaine)

1. No More Mr. Nice Guy (Alice Cooper, Michael Bruce) (From the Shocker Soundtrack)
2. Breakpoint (Mustaine, Ellefson, Menza) (From the Super Mario Bros. Soundtrack)
3. Go To Hell (Mustaine, Ellefson, Friedman, Menza) (From the Bill and Ted’s Bogus Journey Soundtrack)
4. Angry Again (Mustaine) (From the Last Action Hero Soundtrack)
5. 99 Ways To Die (Mustaine) (From the compilation album The Beavis and Butt-head Experience)
6. Paranoid [William Ward, Tony Iommi, Terence Butler, & John Osborne (Black Sabbath)] (From the tribute album Nativity In Black: A Tribute to Black Sabbath)
7. Diadems (Mustaine) (From the Tales From the Crypt Presents Demon Knight Soundtrack)
8. Problems [Johnny Rotten, Glen Matlock, Stephen Jones, & Paul Cook (The Sex Pistols)] (Previously Unreleased)

1. Trust (Mustaine, Friedman)
2. Almost Honest (Mustaine, Friedman)
3. Use The Man (Mustaine, Friedman)
4. Mastermind (Mustaine)
5. The Disintegrators (Mustaine)
6. I’ll Get Even (Mustaine, Ellefson, Friedman, Brian Howe)
7. Sin (Mustaine, Menza, Ellefson)
8. A Secret Place (Mustaine)
9. Have Cool, Will Travel (Mustaine)
10. She-wolf (Mustaine)
11. Vortex (Mustaine)
12. F.F.F. (Fight For Freedom) (Mustaine, Friedman, Ellefson, Menza)

Megadeth Videography

Video Clips (Singles)

Videos from Peace Sells… But Who’s Buying
1. Peace Sells
2. Wake Up Dead

Videos from So Far, So Good… So What!
3. In My Darkest Hour (banned from MTV)
4. Anarchy In The U.K.

From Shocker
5. No More Mr. Nice Guy

Videos from Rust In Peace
6. Holy Wars… The Punishment Due
7. Hangar 18

From Bill and Ted’s Bogus Journey
8. Go To Hell

Videos from Countdown To Extinction
9. Symphony of Destruction
10. Symphony of Destruction (Edited Gristle Mix) (“Symphony of Destruction” single)
11. Foreclosure Of A Dream
12. Skin O’ My Teeth (LIVE)
13. High Speed Dirt (LIVE)
14. Sweating Bullets

From Last Action Hero
15. Angry Again

From The Beavis and Butt-head Experience
16. 99 Ways To Die

Videos from Youthanasia
17. Train of Consequences
18. A Tout Le Monde (banned from MTV)
19. Reckoning Day

Videos from Cryptic Writings 
20. Trust
21. Almost Honest

Long Form Videos

Rusted Pieces (1991 Capitol Records)

Contains all of Megadeth’s videos up to Rust In Peace (Videos 1-6).
 

Exposure of a Dream (1992 Capitol Records)

Contains all of Megadeth’s videos for Countdown to Extinction except for “Sweating Bullets” and including “Go To Hell” (Videos 7-12).
 

Evolver: The Making of Youthanasia (1995 Capitol Records)

Takes place at Fat Planet in Hangar 18 in Phoenix, Arizona, showing Megadeth making their latest album Youthanasia. Includes video clip of “Train of Consequences” (Video 16).
 
 

Click here for the Megadeth Pictorial Discography.  Click here for Megadeth lyrics.