Most often, the mode is used in heavy metal (Metallica's Sad But True being a good example) or as a way to improvise over the m7b5 chord (the ii chord) in a minor ii-V-i progression in jazz – so ...

which is for very good reason! You can apply this formula to any other triad or chord, always adding the 7th a tone below the root note. When you speak to jazz, blues, rock or pop musicians ...