"Hagström - Everything in Music" is a documentary about Albin Hagström who, based on his love of music, built an international empire with manufacturing accordions, guitars and amplifiers. Hagström started a variety of music stores, music schools, and published booklets. The headquarters were located in the small village of Älvdalen, Sweden, but already in the 1930s Hagström had a branch in the Rockerfeller Center in Manhattan. Among Hagström's customers and friends were Jimi Hendrix, Carl Jularbo, Frank Zappa, ABBA, Owe Thörnqvist. Larry Coryell and many others.

Erik Ernsson is on his way to Jon-Persgården in Ångermanland to seek employment. He befriends the old man Janne Vängman.