This is what we found on Wikipedia regarding the Ghost-Note:

Jazz-funk is a subgenre of jazz music characterized by a strong back beat, electrified sounds, and analog synthesizers. The integration of funk, soul, and R&B music and styles into jazz resulted in the creation of a genre that ranges from pure jazz improvisation to soul, funk or disco with jazz arrangements, jazz riffs, jazz solos, and sometimes soul vocals. Jazz-funk was popular in United States and United Kingdom. Similar genres include soul jazz, jazz fusion and acid jazz.