Thanks for all the answers. I think I left out an important fact. I was able to use the following code on a breadboard with my current speaker and it worked perfectly. It was when Itried to combine it into my LED code that I ran into the problem of no sound.
// Pitch follower
//Plays a pitch that changes based on a changing analog input
//circuit:
//* 8-ohm speaker on digital pin 8
// * photoresistor on analog 0 to 5V
// * 4.7K resistor on analog 0 to ground
//This example code is in the public domain.
//http://arduino.cc/en/Tutorial/Tone2
void setup() {
// initialize serial communications (for debugging only):
Serial.begin(9600);
}
void loop() {
// read the sensor:
int sensorReading = analogRead(A0);
// print the sensor reading so you know its range
Serial.println(sensorReading);
// map the analog input range (in this case, 400 - 1000 from the photoresistor)
// to the output pitch range (120 - 1500Hz)
// change the minimum and maximum input numbers below
// depending on the range your sensor's giving:
int thisPitch = map(sensorReading, 400, 1000, 120, 1500);
// play the pitch:
tone(9, thisPitch, 10);
delay(1); // delay in between reads for stability
}