The Variations are models of what such compositions ought to be, though no one has been so rash as to attempt to follow Bach's footsteps. We owe them to Count Kaiserling, formerly Russian Ambassador at the Saxon Electoral Court, who frequently visited Leipzig with Goldberg, already mentioned among Bach's pupils. The Count was a great invalid and suffered from insomnia. Goldberg lived in the Ambassador's house, and slept in an adjoining room, to be ready to play to him when he was wakeful. One day the Count asked Bach to write for Goldberg some Clavier music of a soothing and cheerful character, that would relieve the tedium of sleepless nights. Bach thought a set of Variations most likely to fulfil the Count's needs, though, on account of the recurrence of the same basic harmony throughout, it was a form to which he had hitherto paid little attention. Like all his compositions at this period, however, the Variations are a masterpiece, and are the only example he has left us of this form. The Count always called them “my Variations” and was never weary of hearing them. For long afterwards, when he could not sleep, he would say, “Play me one of my Variations, Goldberg.” Perhaps Bach was never so well rewarded for any composition as for this. The Count gave him a golden goblet containing one hundred louis d'ors, though, as a work of art, Bach would not have been overpaid had the present been a thousand times as large. It may be observed, that in the engraved copy of the Variations there are serious mistakes, which the composer has corrected in his own copy.