As Spotify turns 15, a look at the ways in which it changed how people listen to music, like breaking down boundaries between genres through "mood playlists" (Kristin Robinson/Variety)

Kristin Robinson / Variety:
As Spotify turns 15, a look at the ways in which it changed how people listen to music, like breaking down boundaries between genres through “mood playlists”  —  Ask any executive what the music business was like in the '00s and their face may take on an expression more commonly associated …