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HTML 

              
                #player
  ul.header#header
  
  ul#playlist
        
  ul#controls
    li#previous: .fa.fa-step-backward(onclick="player.previous()")
    li#stop: .fa.fa-stop(onclick="player.stop()")
    li#play: .fa.fa-play(onclick="player.play()")
    li#next: .fa.fa-step-forward(onclick="player.next()")
!

CSS 

              
                // Utilities

// px to ems
@function em($u) {
  @return ($u/16)+em;
}
// color maps
@function color($shades, $shade: 'base') {
  @return map-get(map-get($color, $shades), $shade);
}

//config
$font-primary: 'Nunito', sans-serif;
$font-icons: FontAwesome;
$color-primary: #607D8B;
$color: (
  white: (
    x-light    : transparentize(white, 0.7),
    light    : transparentize(white, 0.5),
    base 		 : white,
  ),
  primary: (
    light    : transparentize($color-primary, 0.75),
    base     : $color-primary,
    dark     : darken($color-primary, 20%),
  )
);

// Extends
%center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

// GLOBAL
img {
  max-width: 100%;
  max-height: 100%;
}
ul, ol {
  list-style: none;
  margin: 0;
  padding: 0;
}


// PLAYER
#player {
  width: em(420);
  margin: auto;
}

.header {
  text-align: center;
  margin: auto;
  color: color(primary);
  background: color(white);
  padding: em(10);
  border-top-right-radius: em(5);
  border-top-left-radius: em(5);
  &__image {
    height: em(120);
    width: em(120);
    margin: auto;
    padding: em(4);
    margin-bottom: em(8);
    border: em(2) solid color(primary);
    border-radius: em(5);
  }
  &__title {
    font-size: em(32);
  }
  &__artist {
    font-size: em(18);
    opacity: 0.75;
  }
  &__duration {
    margin-top: em(8);
    opacity: 0.5;
  }
}



.song {
  > li {
    display: inline-block;
    vertical-align: middle;
    padding: em(4);
    text-overflow: ellipsis;
  }
  &__image {
    height: em(36);
    width:  em(36);
  }
  &__title {
    width: em(130);
  }
  &__artist {
    width: em(130);
  }
  &__duration {
    width: em(40);
    opacity: 0.5;
  }
  &__isplaying {
    width: em(20);
  }
}

#playlist {
  background: color(white, x-light);
  > ul {
    &:hover, &.active {
      background: color(white, x-light);
    }
  }
}

#controls {
  display: flex;
  justify-content: center;
  color: color(primary, light);
  background: color(white);
  border-bottom-right-radius: em(5);
  border-bottom-left-radius: em(5);
  user-select: none;
  > li {
    font-size: 1.5em;
    padding: em(8);
    cursor: pointer;
    &:hover {
      color: color(primary);
    }
    &:active {
      color: color(primary, dark);
    }
  }
  #play {
    display: none;
  }
}

@keyframes volumePlaying {
  50% { opacity: 1; }
}
.fa {
  &-volume-off {
   opacity: 0.5; 
  }
  &-volume-up {
   opacity: 0.5; 
   animation: volumePlaying 2s infinite;
  }
  
}

// DEMO STYLES
body {
  font: 100% $font-primary;
  font-weight: 100;
  color: white;
  background-color: color(primary);
}
#player {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

// codepen viewbox zoom
@media screen and (max-height: 420px){
  body {
    font-size: 75%
  }
}
!

JS 

              
                class Song {
  constructor(title, artist, duration, image) {
    this.title = title
    this.artist = artist
    this.duration = duration
    this.imageUrl = image
    this.isPlaying = false
  }
  play() {
    this.isPlaying = true
  }
  stop() {
    this.isPlaying = false
  }
  toHTML(block, index) {
    // block as in BEM for `header` and `song`
    return `
      <ul class="${block} ${this.isPlaying ? 'active' : ''}" onclick="player.select(${index})">
        <li class="${block}__image"><img src="${this.imageUrl}" alt="${this.title} ${this.artist}"></li>
        <li class="${block}__title">${this.title}</li>
        <li class="${block}__artist">${this.artist}</li>
        <li class="${block}__duration">${this.duration}</li>
        ${ (block === 'song') ? `<li class="${block}__isplaying"><i class="fa fa-volume-${this.isPlaying ? 'up' : 'off'}"></i></li>` : '' }
      </ul>`
  }
}

class Player {
  constructor() {
    this.songs = []
    this.nowPlayingIndex = 0
    this.$header = $('#header')
    this.$playlist = $('#playlist')
    this.$stop = $('#stop')
    this.$play = $('#play')
  }
  add(songs) {
    songs.forEach(song => {
      this.songs.push(song)
    })
  }
  render() {
    this.renderPlaylist()
    this.renderHeader()
  }
  play() {
    this.songs[this.nowPlayingIndex].play()
    this.$play.hide()
    this.$stop.show()
    this.render()
  }
 stop() {
    this.songs[this.nowPlayingIndex].stop()
    this.$stop.hide()
    this.$play.show()
    this.render()
  }
  next() {
    this.stop()
    this.nowPlayingIndex++
    if(this.nowPlayingIndex === this.songs.length) {
      this.nowPlayingIndex = 0
    }
    this.play()
  }
  previous() {
    this.stop()
    this.nowPlayingIndex--
    if(this.nowPlayingIndex < 0) {
      this.nowPlayingIndex = (this.songs.length - 1)
    }
    this.play()
  }
  select(index) {
    this.stop()
    this.nowPlayingIndex = index
    this.play()
  }
  renderPlaylist() {
    this.$playlist.html('')
    this.songs.forEach( (song, index)=> {
      this.$playlist.append(song.toHTML('song', index))
    })
  }
  renderHeader() {
    this.$header.html('')
    this.$header.html(this.songs[this.nowPlayingIndex].toHTML('header'))
  }
  render() {
    this.renderPlaylist()
    this.renderHeader()
  }
}

let player = new Player

// Song list
player.add([
  new Song('Counting Starts', 
           'OneRepublic', '4:17', 
           'https://upload.wikimedia.org/wikipedia/en/3/37/OneRepublic_Counting_Stars_cover.png'),
  new Song('Do it', 
           'Tuxedo', 
           '4:19', 
           'http://static.djbooth.net/pics-artist/tuxedo.jpg'),
  new Song('Paradise', 
           'Coldplay', 
           '4:38', 
           'http://popcrush.com/files/2011/09/coldplay-paradise.jpg')
])

player.play()
!
999px

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