From that moment it was plain that Wolfgang Mozart was a musical prodigy, and as little Nannerl, too, had great talent, the proud father now determined to show them to a world which was ever eager to applaud such genius, and in 1762 he made his first experiment of taking the children on a concert tour. This was so successful that before Wolfgang was eight years old and Nannerl twelve, they had appeared at the Courts of Vienna, Paris, Munich and London, and everywhere Wolfgang made friends with rich and poor alike, his personality was so full of charm and simple dignity.
Once, during their travels, being detained by a heavy shower at Ypps, they took refuge in a monastery. The monks were at supper and did not know of the arrival of any stranger, until suddenly from the chapel came wonderful music, music grave and gay, sad, sweet, thrilling, and marvellous in its appeal to hearts and souls. The Fathers were frightened, not knowing who could have entered their sanctuary, thinking it must be a spirit, when at last a light was brought, and creeping into the chapel, they discovered little Wolfgang at the organ, not a vision, but just a mortal boy. The Fathers were overcome with amazement and lavished all possible courtesies on the wonderful little musician and his family while they remained.
On entering Vienna, at the Custom House, Wolfgang, after a brief chat with the official there, took out his violin, and played to the official, who was so delighted with the boy and his music, that the family had no trouble with examination of their luggage, as they would otherwise have had.
The Imperial family of Vienna were all very fond of music, and had also had their curiosity greatly excited in regard to this child prodigy, so it was not strange that only a few days after the Mozarts arrived, Leopold should have received a command to bring his children to play at Schoenbrum, an imperial palace near Vienna, and this without any effort on Mozart's part to get the invitation.
The Emperor was delighted with the little "sorcerer" as he called Wolfgang, and besides listening to his real playing with deepest interest, he made him play with one finger, in which the little fellow was perfectly successful. Then he asked him to play with the keys covered by a piece of cloth, which he did instantly, and these musical tricks suggested by the Emperor's fancy, thereafter formed a far from unimportant part of Wolfgang's repertoire on his long concert tours, and always interested his audiences. The boy had a keen sense of humour, and always entered heartily into any joke that was made with him, but sometimes he could be very serious, as for instance, when he was called to play for the court composer, George Wagenseil, who was himself a proficient performer on the harpsichord. The Emperor stepped back when Wagenseil came forward, and Mozart said very seriously to him:
"I play a concerto by you, you must turn over the pages for me," and turn the pages the great man did.
The Emperor ordered one hundred ducats to be paid to Wolfgang's father for the performance, and the Empress, both then and later, was kindness itself to both the children, and sent them expensive and beautiful clothes. In writing to a friend at that time, Leopold Mozart said:
"Would you like to know what Wolferl's dress is like? It is the finest cloth, lilac-coloured, the best of moiré of the same colour. Coat and top-coat with a double broad border of gold."
In the portrait which is in the Mozart collection in Salzburg, Mozart is painted in this dress, and he wore it with as much ease as if he had always been used to such finery. Also he never showed any embarrassment or self-consciousness when in the presence of royalty, and once jumped on the lap of the Empress, Maria Theresa, put his arms around her neck and kissed her as effusively as if she had been his mother, while he treated the princesses as if they were his sisters. Marie Antoinette was one of his great favourites after she helped him up from a severe fall on a highly polished floor. To her great amusement he thanked her by saying:
"You are good. I will marry you," and when the Crown Prince Joseph, who afterwards became Emperor, played the violin before the little prodigy, he exclaimed: "Fie!" at something he did not like, then, "that was false!" at another bar, and finally applauded, with cries of "Bravo!"