Groningse Bachvereniging
... that the choir Groningse Bachvereniging sang Bach's Magnificat with Harnoncourts' Concentus Musicus Wien in the orchestra's first appearance in the Netherlands in 1970?
... that the choir <b id="mwAcU"><a href="./Groningse_Bachvereniging" id="mwAcY" rel="mw:WikiLink" title="Groningse Bachvereniging">Groningse Bachvereniging</a></b> sang Bach's <i id="mwAcc"><a href="./Magnificat_(Bach)" id="mwAcg" rel="mw:WikiLink" title="Magnificat (Bach)">Magnificat</a></i> with Harnoncourts' <a href="./Concentus_Musicus_Wien" id="mwAck" rel="mw:WikiLink" title="Concentus Musicus Wien">Concentus Musicus Wien</a> in the orchestra's first appearance in the Netherlands in 1970?