Don't know when they went country, I know they were in 1975, because I met Don the Dude a DJ who worked there, their slogan was with female singers, "WDSD Big Country Stereo 95 Dover". They were WDOV-FM in 1970 so I would imagine it was sometime in 1971 they changed calls but still were MOR, country started in 1973 or 1974, I used to listen to them here in Philly because they were in Stereo and played plenty of music from the 50's and 60's which IMHO is real country, not the whatever stuff that has been out from the 80's to today...