They’ve performed in Carnegie Hall, in the White House, on the Today Show. They’ve toured nearly all 50 states, plus the UK, Belgium, Mexico, Canada, Venezuela and South Africa. And their CD with Chick Corea and Gary Burton earned two Grammys. It’s Harlem Quartet — Jaime Amador, Melissa White, Matthew Zalkind and Ilmar Gavilán — taking the stage in Orange City Monday, Apr. 20 at 7:00pm at the Northwestern College Chapel.