The Thai prime minister’s attempt to woo the country with a rock ballad dubbed Diamond Heart fell flat on Valentine’s Day as netizens panned the lyrics. PM Prayuth Chan-ocha released the jaunty number on YouTube, where it has gathered more than 25,000 thumbs downs, compared with 1,000 positive reactions. Some thought Diamond Heart was a Valentine’s gift to the nation. But a spokesman for the military-backed government played down the association. Prayut, installed as prime minister in August 2014 after leading a coup that ousted a civilian government, has delayed the date of a general election. Most recently, he said an election would take place in November.