Where will you use unsupervised learning?

Given a large dataset of medical records from patients suffering from heart disease, try to learn whether there might be different clusters of such patients for which we might tailor separate treatments.

Have a computer examine an audio clip of a piece of music, and classify whether or not there are vocals $($i$.$e$.,$ a human voice singing$)$ in that audio clip, or if it is a clip of only musical instruments $($and no vocals$).$

Given genetic $($DNA$)$ data from a person, predict the odds of him$/$her developing diabetes over the next $10$ years.