They generally aren't good, and I tend to think they are bad. But I heard a piece of music at the same time as a siren was going off in the distance. And coincidentally, that gave the siren a bit of something that it'd been missing. It wasn't a loud siren, it was very very very faint. I had to mute the music to determine if it was coming from the song or from the distance. But, damn if that low, distant, almost silent siren didn't add to the tune.