Our workshop kit has a small speaker and amplifier connected to pin 2.
(See Kit)
Using the Arduino "tone" function, we can make some noise.

Here's the Arduino language reference for the tone() function:
https://www.arduino.cc/reference/en/language/functions/advanced-io/tone/

tone()

Generates a square wave of the specified frequency (and 50% duty cycle) on a pin. A duration can be specified, otherwise the wave continues until a call to noTone(). The pin can be connected to a piezo buzzer or other speaker to play tones.

...

Syntax

tone(pin, frequency)
tone(pin, frequency, duration)

Parameters

pin: the Arduino pin on which to generate the tone.
frequency: the frequency of the tone in hertz. Allowed data types: unsigned int.
duration: the duration of the tone in milliseconds (optional). Allowed data types: unsigned long.

In the Arduino IDE:
File > Examples > 0.2 Digital > toneMelody

• Change the tone() and noTone() statements in the sketch to  use the correct pin for  the speaker.

• If you'd like, you can use model from the Button exercise to improve this example:
  const int speakerPin = 2;  // the number of the speaker pin

Then, change
    tone(8, melody[thisNote], noteDuration);

to

    tone(speakerPin, melody[thisNote], noteDuration);

Do the same thing for the statement that uses noTone().

Tools > Processor: ATMega32U5 (5V, 16Mhz)

Important! Be sure to select the 5V Processor!

(We are using 5 volt Pro Micros, not the 3.3 volt version.)

Otherwise, when you upload a sketch, you will "brick" the Pro Micro. 

Compile and Upload your sketch.
Does it work?

Change it to do something else:

• Write your own melody

• Use the buttons to play the tones

• Blink the LEDs while the melody is playing

• your ideas?