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I dunno if anybody else here tools around on shortwave radio, but maybe somebody does, and maybe they heard what I heard.  
 
Right now (Saturday, January 19th, 8:29pm CST) on 25830khz (11m), there is some sort of live music show being broadcast. The reception is real poor, but I thought I could make out "Brandon, Manitoba" being said at one point. It would make sense that this would be a local broadcast because 11m is not useful for long distance communication. I can't find any pirate stations on this frequency, so I am going to assume that somebody is broadcasting a show at a local hall or something. I can't really tell though, because of the massive noise.  
 
In the unlikely chance that anybody knows what this is, give me the scoop!

maybe you're hearing a real signal, but it's on a different frequency that's getting into your radio in an unusual way.  
 
There's a few methods of exactly this being possible, but requires more info about where in town, what receiver, the content (for some context).  
Did it last long? Is it continuous?  
Did it seem like a DJ show, or a radio program?  
Were any call letters given?  
What sort of antenna was in use on your radio?  
 
Being nearby two strong transmitters can cause mixing inside a receiver with many unintended and strange consequences. Just try listening to FM band within about a mile of the "hayfield" tower with your car radio for an example of mixing.  
Mixing products are usually easily related mathematically to their sources as even/odd multiples of the difference between their sources.  
 
There aren't any shortwave transmitters broadcasting music in this area, but there are some shortwave-equipped amateur radio operators in the city. They aren't allowed to transmit music, but could possibly contribute to a mixing problem inside your radio if close enough. They (we) also don't generally transmit for more than a minute of two at a time, your experience will help with determining the likelihood of this branch of possibilities.

Here's some details:  
 
- I listened to it for about 40 minutes before it vanished  
 
- It was continuous. Sounded like a live show somewhere, with an MC  
 
- No call letters given that I could hear  
 
- I was using the built in whip antenna in my Grundig G3 Globe Traveller (which, incidentally, everyone but me seems to hate)  
 
I live in the southwest part of the city, with a fairly clear view of the big tower to the south. I've seen a few ham towers around this area, but none within a kilometre or so.

Last time I played with a ham radio receiver I happened to have for a short time, all I come up with was Alex Jones and a few terrifying religiously type stations (obviously skip from down south). Reminded me of when I was a kid, when I would sometimes hunt for skip on the AM band late at night.  
Once found a facinating program on paranormal hauntings.  
 
I can't help but wonder if you may be picking up a nearby wireless entertainment system. Is there anything that may fit that description fairly close by?

A local business sells wireless PA speakers for $500. So maybe you were listening to a social in Brandon. 8:30 pm on a Saturday fits the theory.

We may never know the final answer to the orignal query. I'd hesitate to conclude that a wireless mike system operating normally could cause this... that's just not a frequency which I would think is associated with that tyle of service or equipment. Then again there's always a chance it wasn't operating normally.  
Frequencies I'd expect to find mikes:  
49.8 to 49.97MHZ  
72MHz  
various vhf/uhf frequencies, been a while since I've heard one