Some people's voices you can recognise instantly - some are really low, other just have that idiosyncratic twinge to them. Without seeing them, you can tell who someone is by their voice.
After 5 of a 20 minute barrage of an assembly by Mr. U.M. Monotone today, I found my mind drifting off, which was bad of me considering the subject, but I couldn't concentrate on what he was saying...
Then there are those voices that get your spine all tingly or you just want to listen to for ages.
And why does your own sound so weird on a recording?