The first clear sign of Chinese rock was the 西北风 Xi Bei Feng (literally Northwest Wind). Xi Bei Feng is style of folk-influenced punk music, originating from the northwestern area of China, such as the Shanxi and Gansu provinces. The new style was triggered by two new songs, "信天游 Xin Tian You" and "一无所有". As time passed, Xi Bei Feng became stronger, more fast-tempo and aggressive. In contrast to the mellow C-pop style, XBF songs were sung loudly and forcefully.