Yes, even when I worked at an NPR affiliate station 10-15 years ago, automation like this was common. You could even set up lists of songs by theme ("evergreen", "newly released", "big in the last 6 months", "seasonal") and the software would rotate through them (avoiding playing songs too often or too infrequently as configured), pre-recorded underwriting/PSA's/promotions, station ID breaks, etc. It would even select tracks and subtly slow down/speed up tracks to hit a deadline as needed so that it could, for example switch to live or syndicated programming exactly on the hour without a noticeable interruption.