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.
3. The `getDuration()` method returns `this.soundObject.getDuration()`. It appears to be a wrapper for a method available on `this.soundObject`.
4. The `getTime()` method returns `this.soundObject.getTime()`. It also appears to be a wrapper for a method available on `this.soundObject`.
6. 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`.
7. The `skipTo()` method takes the `percent` of duration of the song it wants to skip to. If the `playState` property is not `playing`, it will:
    - Sets `this.soundObject.setTime` to the functions parameter, `percent` of the `this.soundObject.getDuration`.
8. The `setVolume()` method takes the `percent` of the `this.volume` and sets `this.soundObject.setVolume` to that percent.