红歌：red songs
是赞扬和歌颂革命和祖国的歌曲，是革命实践的真实写照
红歌也可以说成：Traditional Revolutionary Songs
The past few months have seen an upsurge of singing red songs across the country
在过去的几个月里，全国各地掀起了一股唱红歌的热潮。
Upsurge:高潮，热潮

来看一则报道：
A total of 90 ministers and vice-ministers sang in a red song chorus in Beijing on Thursday to celebrate the upcoming 90th anniversary of the founding of the Communist Party of China.
九十名部级和副部级干部本周四在北京举办红歌合唱，庆祝即将到来的建党九十周年。
庆祝……的到来：Celebrate the upcoming
某事的几周年纪念日：数字（序数词）+ anniversary +of
中国共产党：The Communist Party of China 缩写：CPC
合唱：Chorus比如male/mixed chorus（男声/混声合唱）
异口同声的说in chorus
Eg： All the students replied in chorus to the teacher’s question.
所有学生齐声回答老师的问题。

相关的说法还有red tour（红色旅游）、red resources（红色资源）、red relics（红色遗迹）、patriotic education（爱国主义教育）。