LOL. "Frequency Range.... Undisclosed" "Date..... Undisclosed"
What will they say? "We did this last week and it worked fine. If you
couldn't hear it, it must have been because it wasn't audible in the
frequency range you can hear."

Mention of it on a "paranormal" website:
http://www.timetravelforum.net/showthread.php?t=1784&page=12

Also this from: http://www.emusiq.com/
Avril Lavigne's "I'm With You" to fill the Canadian sky
Filed under: announces weird newreleases acoustics shows- AGA @ 8:56
pm
Kingston, ON - Avril Lavigne's heart-felt song, "I'm With You",
has been selected as the first song to fill the skies over Toronto,
Canada in an upcoming acoustic magic show developed by Reichen Minogue
of IMXLabs.com. Dubbed as the "show to end all shows", Minogue
prepares the Canadian population for a "grand event" which will
"dazzle humanity".

"The concept is a magical performance unlike any other prior
magic-based stage production. Using advances in acoustic broadcasting
and quantum sonic mechanics, we have eliminated the need for speakers
outright. Music will literally engulf the entire greater Toronto area
leaving no space void of Avril Lavigne's voice. Her song will be
heard in the middle of the night by no less than five million people
during a single daily broadcast to be repeated over fourteen subsequent
days", he stated during a recent telephone interview.

The show has been titled as 'The Gabriel's Trumpet Project' and
is currently still within pre-production in Cairo, Egypt by Artist
Group Agency (AGA) and Reichen Group Corp (RGC).

No show date has been released.

Source: popmusic.org
Project Website: www.musicfromthesky.com

In Short. Nonsense.. but a diversion from actually doing my job. :-)