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marcin jahr played or cooperated with many polish and foreign musicians like: trumpeters tomasz stańko and piotr wojtasik, guitar player garrison fewell, saxophonists jan "ptaszyn" wróblewski, janusz muniak, zbigniew namysłowski, adam wendt, the band "new presentation" with female vocalist lora szafran, vibraphonist volker greeve, bassist ed schuller and many others.
marcin jahr ha tocado o cooperado con muchos músicos, como tomasz stańko y piotr wojtasik, el guitarrista garrison fewell, los saxofonistas jan "ptaszyn" wróblewski, janusz muniak, zbigniew namysłowski, adam wendt, la banda "new presentation" con la vocalista lora szafran, el vibrafonista volker greeve, el bajista ed schuller y muchos otros.