Martin Persson played bass in the very first line-up of Opeth when the band was founded in 1990.
After he and the others left, they founded Crowley and released one demo on cassettetape called  "The Gate".


Pathalog was a band which existed between 1991 - 1995.
They released 3 demotapes. Martin played drums on all three.

Into It records released a limted edition of the first demotape "Demo #1 1992" in 2024 (IIR 112 ).


Later he was also in a band called Scurvy.
This is a yellow variant copy of their first demotape "Demo 1 '2000".


Remasculate - Till Stench do us Part (Sweden 2004)
Listed as an EP-promocopy, but i am not sure if there is an official release.