an Entity references as follows:
Le marteau sans maƮtre / Pierre Boulez, comp.; Margery Mackay, CA; Arthur Gleghorn, fl.; Milton Thomas, alto; William Kraft, vibraphone... [et al.]; Robert Craft, dir. / Karlheinz Stockhausen, comp.; Arthur Gleghorn, fl.; Donald Muggeridge, htb; Donald Leake, cor anglais... [et al.]; Robert Craft, dir.