Switching buzzer on and off with two transistors
The transistor and resistors are okay for a buzzer that draws a moderate amount of current, 100 or 150mA is fine (forced beta of 10-20). 

If the buzzer is an electromagnetic type, it should have a catch diode across it. Eg. 1N4148. Reverse biased, of course. 

You should have separate resistors for each LED. 

There should be high value pullup resistors (eg. 100K) on pins 14 and 15. Note that this will reverse bias the LEDs to -9V (and the E-B junction of Q2, but no current flows) which is out of spec, but probably okay.