My brother was into "The X" big time in the mid 70's, as he was "The King" of the call-in contests (pre-Stu Denning). He was all of 12 or 13 at the time and my parents even let him have his own phone line installed just for that purpose. He won everything from albums to concet tickets and of course, lots of cold, hard cash! In fact, he won so much money, he had to file a Tax Return one year!
Personally, I was more into WCBS-FM and WNEW-FM at the time and didn't start listening to 99X until around 1978, which was the year I got my first taste of the business. I was working weekends at a High School station in Plainview and used to make regular visits to 99X (along with WNNNNNNNBC!), where I would hang out in the studios with the jocks and get to rummage through the piles of promo singles in their record cage.
One time, I found a promo copy of Fleetwood Mac's "Silver Springs." I brought it to the attention of the Assistant PD/Music Director "Gunshot" Rob Sisco (I referred to him as "Disco Sisco," which he surely didn't appreciate, lol!). He didn't recognize the song title and began to search their albums looking for it. Until that point in time, it hadn't appeared on any Fleetwood Mac LP. Before you knew it, the station began playing the cut, hyping it as "a Fleetwood Mac song not available anywhere!" A couple of days later, I was thumbing through my 45's at home, and noticed that "Silver Springs" was actually the flip side of "Go Your Own Way." I brought the single into the station the following day and showed it to Sisco. No problem, Rob said. He quickly changed the promo to say "not available on any album anywhere!" Today, Rob Sisco is President of Nielsen Music and Chief Operating Officer of Nielsen Entertainment, East Coast Operations.
The summer of 1979 was a very sad time around the station as they began to transition from a 99X (Top 40) to FM99 (Adult Contemporary). In fact, they even hyped the season as "the last summer at 99X." It was the end of an era, as there wasn't a true Top 40 station in the market until Z100 came on the scene in August of 1983.