the examples use pin 5 but each code says pin 8 (Circuit)

[pakair]

/*  Simple Tone player
     Generates a series of tones from MIDI note values.
   The melody is Steve Reich's "Piano phase"

  Circuit:
  - 8 ohm speaker on digital pin 8                                 <----------------------------- pin 8

  created 13 Feb 2017
  modified 22 Dec 2018
  by Tom Igoe
*/
#define NOTE_A4 69         // MIDI note value for middle A
#define FREQ_A4 440        // frequency for middle A

const int speakerPin = 5;  // the pin number for the speaker <--------------------------- pin 5