Hello,
there is an old bug which is still there :
when you play a song, sometimes, the music on the game keep playing during the song, and you ear 2 musics at the same time, that's quite bad.
By exemple, it happened to me twice yesterday : when the commander plays his own song to me and, if I remember well, when Silas sings the song of his childhood.
I'm playing on the 6.60's version.