The reason is that, way back in the heady days of 1981, when MTV actually played music videos, this song ended up being the #3 pop hit of the year. Thus, it saw a lot of play on MTV, and as a 15 year old, I was watching a lot of MTV. During the summer months (and weekends during the school year) I’d regularly stay up painting miniatures and playing wargames, and MTV would always be on in the background.
For whatever reason, I happen to vividly remember painting a selection of Ral Partha 25mm elves as drow (I was very keen on drow as villains back then in those pre-Drizzt days) and this song must have been playing while I was doing so. For whatever reason, when I hear this song on the radio, I invariably think of painting those Ral Partha figures with their black faces and white hair.