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`.

   It checks to see if `this.playState`is equal to `paused` or `stopped`.
   If so, it:
   - Sets the volume to `this.volume`, which was updated as 80.
   - Plays the `soundObject` property.
   - Changes the `playState` property to `"playing"`,
   - Removes the `"paused"` class from the `element` property of `this.currentlyPlaying`
   - Adds the `"playing"` class to the `element` property of `this.currentlyPlaying`

   If not, it:
   - Pause the `soundObject` property.
   - Changes the `playState` property to `"paused"`;
   - Removes the `"playing"` class from the `element` property of `this.currentlyPlaying`
   - Adds the `"paused"` class to the `element` property of `this.currentlyPlaying`

5. The `skipTo()` method accepts one parameter, `percent`. It checks if `this.playState` is equal to `"playing"`.
   If not, the method will be exited.
   If yes, it multiply the `percent` argument by the value of `this.soundObject.getDuration()`, and sets it as the time of the `soundObject` property.

6. The `setVolume()` method accepts one parameter, `percent`. It:
   - Sets the value of `this.volume` property as the `percent` argument
   - Sets the volume of `this.soundObject` as `this.volume`