C Instrument - Level 3 - Digital Download SKU: A0.924917 By Alan Walker. By Alan Walker, Anders Froen, Gunnar Greve, Jesper Borgen, Lars Kristian Rosness, Marcus Arnbekk, and Tommy Laverdi. Arranged by Ed.CAL. Contemporary. Lead Sheet / Fake Book. 2 pages. Ed.CAL #4968025. Published by Ed.CAL (A0.924917). Alan Walker's - The Spectre. Transcribed according to the song and simplified to Am key.