Arguably the best recording ever, of Mussorsky's Pictures at an Exhibition, took place in March and October of 1978
conducted by Riccardo Muti with the Philadelphia Orchestra at the Old Metropolitan Opera House Philadelphia.

(Ah my spelling of Philadelphia is wrong in the title sorry )

I am thinking and hoping it is in some forum members collections. It was on Angel EMI as a LP and was reissued by EMI Classics on CD

Now the quiz is, what is the background sound heard on track 11 at 1.11 ? lasting for at least 6 seconds. For those with the LP The last section The Great gate of Kiev

The Metropolitan Opera House was reopened in December 2018 with a concert by Bob Dylan .