Circuit with buzzer not working :(
There is two kinds of buzzers - active and passive


Passive buzzer means they can be operated by applying  just logic high to + and low to ground.


Digitalwrite function will do this job


Active buzzers needs pulses to make sound. Sound produced depends on the frequency.  Your buzzer might be a passive one. You can make a symphony by applying different frequencies..


'tone' function will help you for this