Note: This post is intended to redirect misinformed searches toward legitimate classic film appreciation. No adult content is promoted or implied.
Look for the original reel print (not the TV edit). The song sequences, particularly those shot in monsoon settings, utilize deep blue filters that define the "classic cinema" look.
Due to the nature of "blue film classic cinema," many of these titles are not on mainstream streaming services like Netflix or Amazon Prime. Here is how to find them legitimately: