There are actually 2 mystery participants. 1 of them is not part of the hangman
Kattelox: The Evils of Lucy: Friday Night Trouble Bound
Eminem – Farewell
Kendrick Lamar – For Sale?
Eminem – Lock it Up
Kendrick Lamar – u
Eminem – Framed
Eminem – Bad Husband
Kattelox: Worldchanger, Rise
Jørn – The Day The Earth Caught Fire
Power Quest – Crunching the Numbers
Jørn – Out to Every Nation
Grave Digger – Tattooed Rider
Grave Digger – Rebellion (The Clans Are Marching)
Burden of Life – Sealing Our Fate
Jørn – Worldchanger
Romdrums: ?
we.own.the.sky – Transmissions of Static
we.own.the.sky – YB-76
Solkyri – Petemkin
Pillars – Dissolution
we.own.the.sky – The Space Between Us
Solkyri – Well, Go Well
Solkyri – Gueules Cassees
Elite: ?
White Walls – Another Sun
Scarlet Stories – The Gallows Tree: Part I Lullaby
Scarlet Stories – The Gallows Tree: Part II The Price You Paid
White Walls – Dead Heart Part III
Scarlet Stories – In Blood and Limbs and Gore and Clay
Train of Naughty: ?
Dystopia Na! – Shadowcasting Horologe
Dystopia Na! – Through Mirrors, Darkly
The Angelic Process – Dying in A-Minor
Ariich: Fifteen Years
Oddarrang – Ohlop
The Reign of Kindo – Let It Go
Submotion Orchestra – Hard to Stay
Submotion Orchestra – 1968
The Reign of Kindo – Till We Make Our Ascent
Oddarrang – 15 Years
Mystery Participant: Peart
?: David Westlake – Ellwood
?: Neil Young and Crazy Horse – Born In Ontario
?: The Lord Weird Slough Feg – Professor's Theme
?: Rush – The Percussor
Nekov: ?
Part 1
?: Temko – 27 February 1990 - 6.977.115.067 km
?: Mr. Bungle – Sleep (Part II): Carry Stress in the Jaw
?: Exxassens – Oniria's Interlude
?: Leech – Silent State Optimizer
?: Exquirla – Canción de E
?: Callisto – Wormwood
?: H.E.A.T – Victory
?: Halo One – Lyricist
?: Exquirla – Destruidnos Juntos
?: D12 – Purple Pills
?: Twelve Foot Ninja – Dig For Bones
?: Aliotta Haynes Jeremiah – Lake Shore Drive
?: Meniscus – Cursed
Part 3
?: The Weapon Is No Longer Under Lock and Key
?: The Hero's Path
?: Of Faraway Places, Bones and Sleep
?: On the Verge of Collapse
Part 2
?: The Butterfly Effect – Worlds on Fire
?: Lights and Motion – Pandora
?: The Butterfly Effect – Sum of 1
?: Immortal Souls – Northern Star
?: Lights and Motion – Antlers
?: Mr. Bungle – Goodbye Sober Day
?: Leech – The Man With the Hammer
?: Meniscus – Infant
?: Tacoma Narrows Bridge Disaster – Calligraphy
Guessed letters: iotradnfsce