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I'm in Australia. This didn't work previously for me, but wonder of wonders, it does now! (16th Feb) It will be great if Siri becomes more useful - the "Can only look for businesses in the United States and when you're using US English" restrictions makes it little more than novelty over here. Cheers.
Worked for me, make sure you ask the same way the dude in the commercials asks: "How do I play a B minor 9th". Siri brings up the same screen you see in the ad. If it doesn't work for you then Siri probably figures you aren't capable of playing it!
The ad shows a screen shot that is WRONG - hard to believe that Apple / Sprint would keep airing that commercial without vetting it first! The notes at the top of the screen show B, D, F#, A and C# - which is correct - but the notation at the bottom has an A sharp - incorrect (unless you want a raised-7th flavor, but it still conflicts with what is shown in the Notes section).