RILM

"An assistant editor at RILM just accessed our 750,000th record, bringing our database to (and now beyond) three-quarters of a million bibliographic entries!

The milestone record is “Pierre Boulez: ‘One cannot refer to the biography to explain the music’”, an interview included in Gustav Mahler: The conductors’ interviews (Wien: Universal Edition, 2013, pp. 38–47)."

http://bibliolore.org/2014/01/18/rilms-750000th-record/
[Bibliolore - The RILM blog]