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Osjan (or Ossian) is a Polish music band active since beginning of the 1970s until now (2012).
Osjan was started at the beginning of the 1970 by Jacek Ostaszewski and Marek Jackowski (who latter moved to Maanam). Over the years, the musicians performing with Osjan often changed. The members of the group included Ostaszewski, Wojciech Waglewski, Milo Kurtis, Radosław Nowakowski, Jorgos Skolias, Tomasz Hołuj, and Zygmunt Kaczmarski. Collaborators of Osjan included Don Cherry, Tomasz Stańko, Antymos Apostolis, Paweł Jarzębski, and Jerzy Słomiński.