Lojze Slak
... that Lojze Slak , a diatonic button accordion player, performed at rock festivals?
... that <b id="mwBjk"><a href="./Lojze_Slak" id="mwBjo" rel="mw:WikiLink" title="Lojze Slak">Lojze Slak</a></b> <i id="mwBjs">(pictured)</i>, a <a href="./Diatonic_button_accordion" id="mwBjw" rel="mw:WikiLink" title="Diatonic button accordion">diatonic button accordion</a> player, performed at rock festivals?