Update: Looks like things have reverted back, and the Sound Search widget is once again unavailable in Canada.
Original story: Though they're still unable to stream from Google Play Music, Canadians now have the ability to use Google's Sound Search widget to identify music. The widget works on home screens and lock screens, and uses your phone or tablet's microphones to match what's playing against Google's vast library of music. (The same library still unavailable in Canada.)
Strangely, MobileSyrup reports that asking Google Now "What's this song" still returns an error message in Canada, while the standalone widget works as expected.
Would it be overly optimistic to think Sound Search's launch in Canada might signal the arrival of more Google music content for Canadians in the near future? Who knows, but surely it's about time.