Geert Jan Kroon (1981 Meppel, The Netherlands) is a musicologist, composer, conductor, music journalist and euphoniumplayer. He works as a conductor at  CMV De Bazuin Uretertp, CMV Jeduthun Oldemarkt, MV Harmonie Akkrum and Flevo Brass Emmeloord. His compositions are published at Tower Editions.

Geert Jan’s musical roots lie in Steenwijk, where he played with Brass Band Crescendo and got his first lessons from Karel Jager. After a career in IT he decided to change to a musical career. He studied Musicology at the Rijksuniversiteit Groningen and did his master at the Utrecht University. As a musicologist he researches French fourteenth century polyphonic music, especially the Roman de Fauvel. He was a guest speaker at the Montpellier Codex Fascicle 8 conference at Oxford University.

He started composing and arranging at a young age and since 2015 his pieces are published by Tower Editions, the foundation of which he is a boardmember. Pieces written by him are: Dante’s Descent, Those Gazing Eyes, Saint Lambert, Soaring the Sky and Fanfare de Angelis. In his composing he searches for a new sound with uncommon scales, cluster harmonies, and micro tonality, without losing the audience in complexity. He was a finalist in the RWCMD/Cory Composition Prize 2016.

As a conductor he started as replacement and assistant with various fanfares and brass bands. He is currently conducting Jeduthun Oldemarkt and Flevo Brass. As a remplacement/tutor he worked, among others, for Soli Brass Leeuwarden, Pro Rege Heerenveen, Wâldbrass Kollum, Concert Band KZHM Zeist and Fanfare de Bazuin de Wetering.

Geert Jan is also active as a euphonium player with Soli Brass Leeuwarden, provides music lessons for various bands, and writes for the Brass Info section in the Klankwijzer. His musical activities he pursues through his company GJK Music (