I would highly consider figuring out some music to put in as a background sound to the game, because there are a lot of games where I got charmed into playing a lot because I loved the music.  Yes I know that most people do end up muting the music and I am not an exception, but I will admit that before it gets boring I tend to love it in the games that I have gotten "addicted" to.  Then I always love how unmuting the music years later will give me a major blast of nostalgia about the early days that I played any specific game with music.

The difficulty in that is the intellectual rights of the artist. CK would require permission, which would inevitably mean a cost.

I a**ume you're talking about when one is exploring in the world? I can see the value in that, otherwise, I'm getting bad flashbacks to the days of MySpace and those custom profiles

I do have some royalty-free music, but I suspect most people would find it annoying as they're usually playing the game while doing other things.

We actually tried it at the very beginning of the game. It even used to verbally tell you that you'd been attacked. lol

Something to think about though. I'd have to see what other games of this genre do.

I did go back to utopia(not the click site the kingdom management game) just because of the music.

I was more thinking about trying to make some kind of new music.  Something that would be unique to this site.  If you're worried about people having other sounds on, I'm sure that no matter what game they played they would mute it if they really wanted to pay attention to something else.  Like I said every game music does tend to be muted by most people eventually.

I guess even if you did pay someone to make a cute little tune, or some kind of futuristic techno type music, that would still cost money.  Maybe it would be better to try something free first to see how people react to it.

I would be more on the side of having a sound play when the raids are formed, joined and started.  It's nice to be reminded so the "orbits" don't last too long.