It remains unclear, however, how much of the immediate post-release sentiment is bravado, or rhetoric intended for public consumption.
But by the time the song had been released, sentiments were starting to change.
Beyond content classification, Google is also releasing updated sentiment analysis that allows customers to parse the sentiment of individual places or things.
A barometer of consumer sentiment released Friday by the University of Michigan held steady in March; analysts had expected it to decline.
A report said manufacturing activity fell slightly in December, and a barometer of consumer sentiment released by the University of Michigan rose slightly this month but fell short of expectations.
The University of Michigan's index of consumer sentiment, released Friday, rose this month to its second-highest level in nearly five years.
Some investment banks were predicting that short-term rates would rise to 7.25%, by mid-August.A few statistical releases later, market sentiment is exactly the opposite.
That pattern was apparent in a Thomson Reuters/ University of Michigansurvey of consumer sentiment released on Friday, according to Richard T. Curtin, who directs surveys of consumers at the university.
Better readings on construction spending, manufacturing and consumer sentiment released on Friday also allayed fears that had arisen from a sour report on the nation's economic growth earlier in the week.
The central bank's own quarterly Tankan survey of business sentiment, released on December 15th, confirmed that corporate Japan remains upbeat about future profits, with confidence spreading from large manufacturers to smaller firms.
Moreover, the economy remains fragile: the Bank of Japan's latest quarterly "tankan" survey of business sentiment, released on October 1st, suggested that the tentative economic recovery is losing momentum, and that company executives remain intent on cutting capital spending.
