1. This file declares a class, `Player`, instantiates it, and assigns it to a global `player` variable.
2. The `Player` class contains four methods:
    - `constructor()`
    - `playPause()`
    - `skipTo()`
    - `setVolume()`
3. The `constructor()` method sets initial values for the `currentlyPlaying`, `playState`, `volume`, and `soundObject` properties.
    - `currentlyPlaying` is set to the first item in `album.songs`.
    -  The initial `playState` is `"stopped"`.
    -  The `volume` is set to the number `80`.
    -  The `soundObject` instantiates a new `buzz.sound` object using the `soundFileUrl` property of `this.currentlyPlaying`. The `buzz` variable doesn't appear to be initialized here, so presumably it's a dependency loaded elsewhere.
4. The `playPause()` method accepts one parameter, `song`. It sets it to `this.currentlyPlaying` by default. It checks to see if `this.currentlyPlaying` is different from `song`, and if so, it:
    - Stops the `soundObject` property.
    - Removes the `"playing"` and `"paused"` classes from the `element` property of `this.currentlyPlaying`.
    - Sets `this.currentlyPlaying` to the function's parameter, `song`.
    - Changes the `playState` property to `"stopped"`.
    - Instantiates a new sound object using `this.currentlyPlaying`, which was just updated to `song`.
    If `this.playState` is equal to `paused' or 'stopped':
    - The `soundObject` property's volume is set using `this.volume`.
    - Plays the `soundObject` property.
    - Changes the `playState` property to `'playing'`.
    - Removes the `playing`class from the `element` property of `this.currentlyPlaying`and adds class of `paused'.
  5. The `skipTo()  `method accepts one parameter `percent` It checks to see if `this.playState` is different from `playing` if so it:
  - The`soundObject`property is set to the time (percent / 100) multiplied by the property of`this.soundObject` using the getDuration() method.
  6.  The `setVolume()  `method accepts one parameter `percent`it:
 - Changes the `volume` property to equal parameter `percent`
 -  The `soundObject` is set to volume value of `percent `