Biography
1) Tref is a Belgian folkgroup, with the diatonic button accordion (in Dutch/Flemish: "trekzak") as their main instrument.
members:
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Diatonic button accordion:
* Wim Claeys
* Didier Laloy
Percussion and Berimbau:
* Frédéric Malempré
2) Treff is a hard rock band from Hungary.
Biography text from Last.fm, available under CC BY-SA.