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`.

    The 'playPause()' method also checks to see if 'this.playState' is equal to '"paused"' or if 'this.playState' is equal to '"stopped"', and if so it:
    - Sets the volume of the 'soundOject' property to 'this.volume' value, which is initially set at 80
    - Plays the 'soundObject' property.
    - Sets 'this.playState' to '"playing"'.
    - Removes the '"paused"' class from the 'element' property of 'this.currentlyPlaying' and adds the '"playing"' to the 'element;           property of 'this.currentlyPlaying'
    but if 'this.playState' is not equal to either 'paused' or 'stopped', and if so it:
    - the 'soundObject' property is Paused.
    - Sets 'this.playState' to 'paused'.
    - Removes the '"playing"' class from the 'element' property of 'this.currentlyPlaying' and adds the '"paused"' to the 'element;           property of 'this.currentlyPlaying'

5.  The 'skipTo ()' method accepts one parameter 'percent'.  It checks to see if 'this.playState' is different from 'playing', and if so it:
    - 'return' or  exits out of the 'skipTo' method.
If 'this.playState' is the same as 'playing', if so it:
    - Sets Time as a (percentage/100) * ('getDuration ()' value of the 'soundObject' property)

6.  The 'setVolume ()' method accepts one parameter 'percent'.
    - Sets 'this.volume' to percent value
    - Ses volume percent of the 'soundObject' property