Lobby Music Starts and Will Not Stop After Leaving Lobby

The music starts when I click the PLAY button.

The music is the same as the champ select music in Normal Blind Pick. So when I'm forming a party, the music starts playing and then if I leave the lobby, the music doesn't stop. And then when I do get into the champion select, there is absolutely no music that plays.

Has anyone else experienced this? I just assume it's a bug. Or maybe Sona is trolling us...