Erik Satie’s 1893 composition Vexations bears an inscrutable inscription: “In order to play the theme 840 times in succession, it would be advisable to prepare oneself beforehand, and in the deepest silence, by serious immobilities.” This seems to mean that the piece should be repeated 840 times in performance, which would take 12-24 hours, depending on how you interpret the tempo marking “Très lent.”

“It is perhaps not surprising that few of the performances [Gavin] Bryars lists have been complete,” writes Robert Orledge in Satie the Composer, “for with the bass theme repeated between each 13-beat harmonization, it recurs 3,360 times.”

“It is probable that Satie’s vexations are those expressed in the latter part of his difficult relationship with Suzanne Valadon, that is to say, somewhere between April and early June 1893.”

In 2008 James Plakovic spent six weeks composing this score for 37 instruments — woodwinds, pianos, brass, and strings. “Every land mass has been transformed into musical notation,” he says. “A note, a rest, a slur, some musical expression mark such as forte or pianissimo, so that the end result, when you step back from the image itself, is that you see land. You see a part of the world.”

“The music is very busy,” he admits. “There are some spots that are flowing and harmonious, and there are definitely areas that are a bit brash and discordant. And that reflects how the world is.”

From the Flemish painter Cornelius Gijsbrechts, a painting of the back of a painting (1670):

“The Reverse of a Framed Painting was not intended to be hung on the wall, but to be placed against it,” writes Olaf Koerster. “The viewer would be deceived into trying to turn the picture around, only to see the reverse of an unframed painting: Gijsbrechts had created the paradoxical painting with two backs.”

That’s Rembrandt’s engraving The Three Trees on the left, and its mirror image.

Art historian Heinrich Wölfflin found that reversing the image produces a distinctly different aesthetic effect. In the first image, “the group of trees at the right gives an impression of energy”; in the second, “the trees are devaluated and emphasis now seems to rest on the flat, extended plain.”

But curiously, writes Chris McManus in Right Hand, Left Hand, “although ordinary viewers say [such reversals] look different, they cannot reliably decide which is the original and which the mirror-image, unless they have seen the picture before.” Whom can we credit for the second composition?

Giuseppe Verdi received this letter in May 1872:

Much-honoured Signor Verdi, — The 2nd of this month I went to Parma, drawn there by the sensation made by your opera Aida. So great was my curiosity, that one half-hour before the commencement of the piece, I was already in my place, No. 120. I admired the mise en scène, I heard with pleasure the excellent singers, and I did all in my power to let nothing escape me. At the end of the opera, I asked if I was satisfied, and the answer was ‘No.’ I started back to Reggio, and listened in the railway carriage to the opinions given upon Aida. Nearly all agreed in considering it a work of the first order.

I was then seized with the idea of hearing it again, and on the 4th I returned to Parma; I made unheard-of efforts to get a reserved seat; as the crowd was enormous, I was obliged to throw away five liri to witness the performance in any comfort.

I arrived at this decision about it: it is an opera in which there is absolutely nothing which causes any enthusiasm or excitement, and without the pomp of the spectacle, the public would not stand it to the end. When it has filled the house two or three times, it will be banished to the dust of the archives.

You can now, dear Signor Verdi, picture to yourself my regret at having spent on two occasions thirty-two liri; add to this the aggravating circumstance that I depend on my family, and that this money troubles my rest like a frightful spectre. I therefore frankly address myself to you, in order that you may send me the amount. The account is as follows:–

Hoping that you will deliver me from this embarrassment, I salute you from my heart.

Bertani.

My address: Bertani Prospero, Via San Domenico, No. 5

Verdi asked his publisher to reimburse the man’s expenses, except for his supper (“He might very well take his meals at home”), in return for a written acknowledgment “undertaking to hear my new operas no more, exposing himself no more to the menaces of spectres, and sparing me further traveling expenses.”