There was no audience for this performance; it's a studio performance.

Answer in the description. Answer obvious.

@@Fairpavel In the six years that had passed since 1953, and her first recording of Lucia di Lammermoor, Callas’s voice had maybe become less robust, but her singing had become still more perceptive. As Gramophone said: ‘Mme Callas has refined her interpretation of the role, and made it more exquisite, more fascinating, musically and dramatically more subtle - in a word, more beautiful.’ Experience Maria Callas' legendary portrayal of Lucia, joined by Ferruccio Tagliavini and Carlo Del Ferro, under Tullio Serafin's baton. This iconic 1959 recording captures opera at its peak. Not just a recording but a testament to the enduring power of opera, this recording continues to be celebrated, revered, and cherished by opera enthusiasts and music lovers worldwide. Gaetano Donizetti 1797-1848 Lucia di Lammermoor Dramma tragico (tragic opera) in three acts · Libretto: Salvadore Cammarano Lucia ....................................MARIA CALLAS Edgardo................................FERRUCCIO TAGLIAVINI Lord Enrico Ashton..............PIERRO CAPPUCCILLI Raimondo.............................BERNARD LADYSZ Arturo...................................LEONARD DEL FERRO Alisa.....................................MARGRETA ELKINS Normanno...........................RENZO CASELLATO Tullio Serafin, Philharmonia Orchestra and Chorus Recorded: 16-21.III.1959, Kingsway Hall, London (STEREO) Producer: Walter Legge · Balance engineer: Christopher Parker Remastered in 2014 from the original tapes at Abbey Road Studios I don't see the answer to my question here. Unless Kingsway Hall is a well known theater to locals...Londoners.... But it isn't to me. Perhaps you might have just answered instead of chastising me.

@@renzo6490 If you don't see the answer to your question here, it means you do not read or did not read. it is a studio recording with balance engineer and a producer made in a church for about 6 days. And obviously, the quotation begins with a first recording, so there is even more information.