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Magma is an Amsterdam-based, international music agency founded by Michael Bertoldini and Seppl Kretz in 2022.
We work with creative agencies, directors and brands to amplify the impact of their vision through the primal force of music and sound.


Michael Bertoldini

Managing Partner and Music Supervisor

Seppl Kretz

Managing Partner and Creative Director

Gyo Kretz

Music Producer and A&R Manager

Martijn Van Lent

Head Of Finance

Jim Albers

Publishing and Partnerships



Rapenburg 21H
1011 TT Amsterdam
The Netherlands


Pieter Goedkoopweg 10
2031 EL Haarlem
The Netherlands