by Morwenna Brett Sarah Best plays BWV 592 on the St Bavokerk organ, under the watchful eye of tutor Reitze Smits. What pipe organ would you expect to see on the wall of an organ scholar’s bedroom? The 1735 Christian Muller instrument of the St Bavokerk, Haarlem, of course, in all its beauty and grandeur. No flashy modern celeb, this is a pin-up of the old-fashioned school - the Gina Lollobrigida or Sophia Loren of the organ world. As is often customary in the Low Countries, it’s owned by the municipal authority, not the church it…