Speculative editorial. Radio is essential to GTA atmosphere and is region-coded by design.
Likely musical territories
Latin / reggaeton on the Little Havana side. Hip-hop / Miami bass coastal. Synth-pop / 80s-coded on the strip (callbacks). Country in the rural towns. House and EDM on the nightlife.
Every Rockstar GTA has done region-coded radio. GTA 6 will do similar.