But, as the recent slew of song crossovers to multiple formats shows, "categories" are very arbitrary. Thinking of music in terms of types is dangerous as those crossovers show.
In a very distinct case, back around 1995 Spanish AC station KLVE found a song that was "exploding" in Latin America. It was anything but AC. The song was a 90's remake of a Colombian "Vallenato" song from 1938. And Vallenato is the country music of northeastern Colombia... sorta' like Cajun music in parts of Louisiana.
The song was everything but AC. It was rhythmic and KLVE did not play rhythmic songs. It was South American regional folk music, and KLVE programmed for people mostly from Central Mexico. It was way up tempo, and KLVE had the feel of stations like KOST in LA or WLTW in NYC. It had lyrics in rural Colombian Spanish, a dialect and vocabulary unknown in Los Angeles.
Yet there was something about the song that we liked, as it was a fun song insofar as it "feel" was concerned. It smelled like "variety" and "excitement" in a relatively dull format. You can hear it at
We played it. KLVE had intensive weekly callout, and by the second week... unusual for an AC station song to be "felt" before at least 3 full weeks... it was the highest scoring song of all currents. It stayed that way for over 9 months.
So...
Categorizing music is both personal (subject to the pair of ears and intervening brain of the "judge") and imprecise. Nearly 70 years ago, those earlier mid-50's Top 40 stations in most of America played Johnny Cash's "Ring of Fire". A country song? No. A hit? Yes.
To much categorization establishes arbitrary borders. While we can determine down to the minute how old a person is or what their income level or educational level is, we really can't do that with any kind of art, whether we are comparing Picasso with Monet or The Beatles with Eminem.