So one time the famous Russian pianist Vladimir Horowitz was performing the Tchaikovsky Piano Concerto No.1 with Toscanini. In the middle of it, Horowitz forgot his music, so he was whispering to Toscanini, "ps... Toscanini..... where are we?". Toscanini was too into the music, so no response... Horowitz whispered again, "hey, ps... where are we?" This time Toscanini whispered back, "at Carnegie!".