It seems impossible to generate an era-specific playlist. For instance, a request incorporating "description=70s" returns a list which includes artist_name: "The Rolling Stones" with title: "(I Can't Get No) Satisfaction". Obviously the Stones were active in the 70s but "Satisfaction" is from the previous decade.
This is not an isolated instance. Requests for other decades yield similar anomalies.
Is it not possible to confine titles to the era requested? I realise it's complicated; but can't titles be derived from dated releases by the given artist?