Several substyles exist, including maibock (helles bock, heller bock), a paler, more hopped version generally made for consumption at spring festivals; doppelbock (double bock), a stronger and maltier version; and eisbock, a much stronger version made by partially freezing the beer and removing the ice that forms.
Scientists describe seven basic tastes: bitter, salty, sour, astringent, sweet, pungent (eg chili), and umami. There are however five basic tastes that the tongue is sensitive to: salt, sweet, bitter, sour, and umami, the taste of MSG.
Note that the different types are located at different areas of the tongue.  The sense of taste is a combination of taste as well as smell, texture, and temperature. Cold food tastes different than hot food. If you squeeze your nostrils closed when you eat you will not taste the food as strongly.