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`.
5. If the `playState` is `"paused"` or `"stopped"`
    - The `setVolume` is set to `this.volume`
    - Plays the `soundObject` property.
    - Changes the `playState` property to `"playing"`
    - Removes the `"paused"` class from the `element` property of `this.currentlyPlaying` and adds `"playing"`class
   Else
    - The `soundObject` property is paused
    - Changes the `playState` property to `"paused"`
    - Removes the `"playing"` class from the `element` property of `this.currentlyPlaying` and adds `"paused"`class
6. The skipTo( ) method accepts one parameter, "percent." It checks if the `playState` property is different from `"playing"`, and if so, it returns:
    - The `soundObject` property is set to the time (percent / 100) multiply by the property of `this.soundObject`, the `getDuration()`     method
7. `setVolume()` accepts one parameter, `percent`
    - `this.volume` is set to a percent
    - `this.soundObject` is set the value of the percent of `setVolume`.