Music
In my free time, I play the classical double bass in different settings, e.g.,
The symphony orchestra Filialen, a project based orchestra with a lovely mix of amateurs, music teachers and music students from the Stockholm area:
The Mazer String Quartet Society, also based in Stockholm.
The symphony orchestra Bergslagens Kammarsymfoniker which involves amateurs, music teachers and music students from all over southern Sweden and Norway, with a center of gravity in Bergslagen (200 km west of Stockholm).
The KTH Academic Orchestra, mainly consisting of students and teachers from KTH. Fun piece of trivia: almost 1% of the full professors at KTH play the bass in this orchestra.