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Gaster's Theme (from Undertale)

Digital Sheet Music

By Toby Fox

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Piano Solo - Advanced Intermediate - Digital Download
By Toby Fox. Arranged by Brianne Lundberg. 4 pages. Published by Brianne Lundberg (C0.1049701-MCMP-001-105).

Item Number: C0.1049701-MCMP-001-105

Gaster's Theme from Undertale is a simple, four-bar repeating phrase that fills you with questions, mystery...and a slight sense of creepiness. This late intermediate piano solo takes the original phrase and expands upon it, developing the eerie musical progression further into a full solo piano piece.

In this arrangement, the right hand maintains the constant original melody line while the left hand works its way down to progressively lower and darker tones. Toward the end, the right hand picks up the original lower harmony part as well while the left hand continues its sinister progression.

This is a late intermediate piano arrangement in D minor. 3 pages (plus cover), includes repeat. The largest harmonic interval is M9. 

Brianne Lundberg is a Composer, Arranger, and Piano Instructor. In addition to publishing with SMP Press, she has published many arrangements and original compositions for piano and a variety of other instruments and ensembles. For more of Brianne's music or to request a custom arrangement, visit

About SMP Press

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