A longer Vietnam war is one of the more popular subjects in post-War AH, as is anything to do with Vietnam in general. One of the bigger things about Vietnam in public thought is that it's recognized for a sort of war soundtrack; some songs that were just popular during the era, some that were popular with the soldiers, some were just normals songs and others were written about the war itself.
So let's say we have Vietnam continue as an American war past 1973, and into the 1980s. First, what effect would that have on music itself? Second, what songs of post-1973 of the OTL would be befitting this continued Vietnam?