If you saw the Smashing Pumpkins live between late December 1999 through the end of May 2000, it is likely Pale Scales was the 1st song you heard them play live (but not always). The instrumental track was commonly played before the band would break into playing The Everlasting Gaze or Heavy Metal Machine.
The track was never officially released, but an assumed studio version graced the Smashing Pumpkins Greatest Hits Video Collection when you were in the Gish menu.
The song has been played a total of 35 times live.[youtube https://www.youtube.com/watch?v=ZvC-OtOWQI4]