These four face-down cards contain all four suits and the values Ace,King Queen and Jack. Here are 5 clues to help you figure out what each card is :

1-The Ace is to the right of the Spade
2-The Diamond is to the left of the Queen
3-The Club is to the right of the Queen
4-The Heart is to the left of the Jack
5-The Spade is to the right of the Jack.

For the sake of clarity,assume that the clues pertain to the cards as they face the reader.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

K-hearts / J-diamonds / Q-spades / A-clubs

This may be solved by drawing four boxes. In each box, write "AKQJ" (for the possible value) and "SDHC" (for the suit). Narrow down the possibilities with Mozart's clues until you have the final solution.

Excellent Coldfuse.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~