Mattias Holmgren

68K subscribers

966 videos

What happens when a pro composer hears your favorite game music? I’m Mattias Holmgren (aka Gelhein), a Swedish producer and designer with 25+ years of indust...

Latest Videos

I Built My Dream Plugin Morningdew Arpeggiator

Honkai Star Rail OST Is Listening Event & Composer Reaction

I got actual goosebumps Midday Prospects Live vs. In-Game (Genshin Impact)

Hollow Knight Silksong (Piano Cover)

Composition Masterclass Genshin Impact (Main Theme analysis)

The Haunting Hurdy Gurdy and melodies of Rerir's Theme Genshin Impact Analysis

The Magic of the Handpan in C418’s Aria Math

Technically Perfect. Metal Vocalist ANALYSIS of Maphra's Bring Me The Horizon Doomed Cover.

Field of Hopes and Dreams cover with UVI Vintage Casio Legacy Authentic 80s Keyboard Sounds

DEATH STRANDING 2 To The Wilder - Woodkid REACTION (With Piano Cover)

Behind The Scenes - Summer Studio Is Too Hot

Composer Reacts to Arkveld Theme Medley (Monster Hunter Wilds)

MHW Iceborne Safi'jiiva, A Masterclass in Dragon Themes (composer reacts)

Behind The Scenes 203 (Lighting & Stream Setups)

The AI Music Trap Why You Don't Actually Own Your SunoUdio Hits

Use Hardware Effect Pedals Like Plugins with FreqInOut FO1

How to Add Harmonic Glue to Dull Mixes (HOFA Colour Saturator)

Hollow Knight Silksong - Bilewater (Official Acoustic Cover)

Hollow Knight OST The Evolution Of Christopher Larkin (Composer Reaction)

PHANTOM is Silksong's most underrated boss! (Full Fight)

Monster Hunter World Fatalis is TERRIFYING Composer Reacts to Fatalis Medley

Outer Wilds OST Reaction Timber Hearth feels like home

Listening to Expedition 33 as a father broke me A Deeply Personal Reflection

TONEX Pedal Bass Edition Review (Machine Modeling Bass Amps & Stompboxes)

Metal Gear Solid 4 Old Snake COMPOSER REACTION

Reacting to the wildest EDM-Opera fusion in gaming history (Clair Obscur Expedition 33)

The TGA 2025 Orchestra still gives me chills (Silksong, Expedition 33, DS2)

Nightreign's OST is Mastery. My Top 3 Boss Tracks Ranked

Composer Reacts Beast Clergyman Boss Theme (All Phases) Elden Ring OST

I'm OBSESSED with Time to Swim Swim Clair Obscur Reaction & piano solo