Welcome to the forum, Annie in Idaho.
You can take the code example that you have already seen on the tone library page -
#include <Tone.h>
Tone tone1;
void setup()
{
tone1.begin(13);
tone1.play(NOTE_A4);
}
void loop()
{
}
and integrate it with this snippet of code from the button tutorial at http://arduino.cc/en/Tutorial/Button -
const int buttonPin = 2; // the number of the pushbutton pin
int buttonState = 0; // variable for reading the pushbutton status
void setup() {
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);
}
void loop(){
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);
// check if the pushbutton is pressed.
// if it is, the buttonState is HIGH:
if (buttonState == HIGH) {
// play your tone here
}
}
The circuit diagram for the button is at the link above.
Hope that helps.