User blog comment:ShitaraRen/Music from Events/@comment-1004812-20130625013648

My thoughts exactly sort of. I was thinking more on the BGM on the dialogue side rather than the event's page. -w-

Ah, it is not sure if both of those BGMs will be in the incoming event. I personally think BGM17 was meant for Summer Breeze Superstar event, but eh it wasn't used so yeah.

Considering what Bibimbap mentioned though, which I feel for, I'd suggest putting the current/incoming event's music in its page only when the event has ended.

The music does not play by itself automatically, at least tried on Firefox and Chrome. I'm not sure if there are other browsers that play wiki-embed music files automatically though.