The Coke Terrace was used, along with the Tommorrowland stage, as an important music venue. In the late '60s, during Summer and Holiday time, there was always name entertainment. I saw Gary Puckett and the Union Gap....The Five Americans...The Classics Four.....Booker T and the MGs.....Sam and Dave...and others perform there. Disney was serious about their bookings because these were all bands who had hits on the radio at that time.
Even if you had to pay admission, I think it was $4 at the time, it made for a fun and inexpensive evening of dancing to live music.