“It sounds like all the songs were recorded ten years ago, left in a vault to mature to archaism and then brought out in a fit of nostalgia.”
“I have always seen the position of the traditional mayor as an amusing archaism.”
“Again, as in the case of muncho, haiga, the present subjunctive of the verb haber, is also an archaism still found in many dialects of Spanish.”
archaic
(archaeology, US, usually capitalized) A general term for the prehistoric period intermediate between the earliest period (‘Paleo-Indian’, ‘Paleo-American’, ‘American‐paleolithic’, &c.) of human presence in the Western Hemisphere, and the most recent prehistoric period (‘Woodland’, etc.).