Live ATC lets you listen to realtime ATC (Air Traffic Control) audio, using the ATC API that I built. You can use Live ATC by searching available airports or featured/popular airports on the landing page. Then you must select a frequency that has a status of UP. Then your audio will load and start playing automatically.
If you want a suggestion Airport and frequency, I recommend KATL - Hartsfield Jackson Atlanta International Airport and frequency KATL Tower.