John Silvia is the senior economist at Wells Fargo Bank: "Private payroll gains continue to be modest and I would say it does raise flags for those super optimists who were looking for a V-shaped recovery and thinking that we are going to go back to normal very quickly in the US.economy."

VOA: standard.2010.07.02

Okay. Now watch what happens as we continue with this I,VI,IV,V,I progression.

好，在这一段I-VI-IV-V级的和弦进行后，音乐发生了什么变化呢。

耶鲁公开课 - 聆听音乐课程节选