Twenty-four packets of sheets music are in a folder. If the chorus students decide to share 3/8 of the packets, how many did the share?

Three-eighths of the packets is (3/8)*24 = <<3/8*24=9>>9 packets of sheets. Answer: \boxed{9}.

To find out how many packets the chorus students shared, you need to calculate 3/8 of the total number of packets in the folder.

First, you calculate the number of packets the chorus students shared:
3/8 * 24 = (3 * 24) / 8 = 72 / 8 = 9

Therefore, the chorus students shared 9 packets of sheet music.