Acid Jazz

Acid jazz (also known as club jazz, psychedelic jazz, or groove jazz) is a music genre that combines elements of funk, soul, and hip hop, as well as jazz and disco.[1][2] Acid jazz originated in clubs in London during the 1980s with the rare groove movement and spread to the United States, Japan, Eastern Europe, and Brazil. Acts included The Brand New Heavies, D'Influence, Incognito, Us3, and Jamiroquai from the UK and Buckshot LeFonque and Digable Planets from the U.S. The rise of electronic club music in the middle to late 1990s led to a decline in interest, and in the twenty-first century, the movement became indistinct as a genre. Many acts that might have been defined as acid jazz are seen as jazz-funk, neo soul, or jazz rap. https://en.wikipedia.org/wiki/Acid_jazz

Why so-called acid jazz is not a sub-genre of jazz.
What makes the problem hard to begin with is so-called acid jazz itself is unclear what sort of musical genre it is in itself. The term acid jazz was coined by some DJ's to label a particular style of, in effect, lounge and dance music of a relatively distinctive style type. Acid jazz tends to be highly repetitive, has a characteristic rhythmic pulse and muscular groove, can have significant synthesizer usage, and may use obscure jazz tracks as components of the sounds produced. It doesn't take too long before one gets convinced that as a type of musical genre, acid jazz is not a coherent jazz sub-genre. Wikipedia goes so far as to say it is no longer even an actual musical genre because it has been dropped for better descriptive genre names that better reflect the kind of music presented, such as Fusion Rap.

Acid Jazz is a crossover genre gone too far: there is barely any Jazz left in it. There’s actually almost zero ‘acid’ about it as well, except a slight psychedelic sound, placing it high on the chart for poorly chosen genre names. In fact it’s more of the deepest funky Fusion combined with Rap, so Fusion Rap would be more appropriate. But the name is no error: Acid Jazz was a deliberate and firm reaction from the British Soul scene against the fiddling “nonsense” of Acid House. The leading record label – also named Acid Jazz – was determined to compensate Acid House with what they regarded as “quality music”, heavily influenced by Rare Groove records. A steady Hip-Hop breakbeat, lots of percussion, Jazz harmonies and funky basslines (often with the aid of a synthesizer) are the key flavors of Acid Jazz. These elements blend perfectly until the roots of the genre are no longer traceable. It was a short but popular craze, right before EDM conquered the music scene. Due to its highly danceable nature, a new type of dance, Jazzdance, was invented along with it (which became more or less a synonym of the music itself). It can be hard to separate Acid Jazz from Jazz Funk with heavy breaks, if it wasn’t for the (abundant) use of vocals. https://musicmap.info/