The story is 100% bogus. Here's how to tell:
He and several other general authorities had set up a three-hour meeting with bishops and stake presidents to discuss why Venezuela had yet to be blessed with a temple.
As the meeting began, loud rock music poured into the room through the open windows, drowning out the discussion. It was too hot to close the windows.
Cook asked two young men to go see what could be done to shut down the music.
Since when are "young men" allowed into meetings with General Authorities, bishops, and stake presidents?
One man in the group asked him if he realized what he was asking and explained that the "noise" was coming from a nearby rock concert that had been sold out for weeks.
"Is anything too hard for the Lord?" Cook asked before he instructed the congregation to pray for the messengers' success.
It turned out that the two young men sent off persuaded the lead guitarist in the band to hold off warming up for an hour, bearing testimony to an amused musician that they were on a Lord's errand.
Since when can two young men simply walk onstage and chat up a lead guitarist during--or even prior to--a sold out rock concert?
Three hours later, the meeting ended and Cook and others realized they'd heard nothing from the band.
When they looked outside, they discovered it had been raining hard for two hours, effectively shutting down the outdoor concert.
What was the point of talking to the lead guitarist at all? Why didn't the Lord just make it start raining one hour earlier and save the two young men the trip?
And if that weren't enough, instead of sending two young men to go onstage and ask a lead guitarist to stop playing for an hour, and instead of raining out the event and ruining it for thousands of people, why didn't the Lord just make it a little cooler inside the room so they could shut the windows?
And to top it all off, why didn't they A) simply wrap the meeting up in one hour, the selfsame hour in which the lead guitarist had been persuaded to hold off on warming up, or B) have them start the meeting an hour later, the hour in which He was going to make it rain?
This story has more holes than swiss cheese. I don't believe a word of it.
(John Larsen: What does that image have to do with faith shutting down a rock concert?? Throw me a bone here.)