Menus are usually presented with two parallel price charts. On the left the price of the food and drink only. On the right the same price with service and tax added. The service charge is ordained by Greek law so additional tipping is really a recognition of special service for special requests. The tip on the plate is for the waiter, the tip on the table is for the busboy who served the water, brought extra bread and so on.
Busboys work for tips alone.
Bouzouki music is similar to the American Blues with many adaptations and intensities. The analogy is not accidental either. Bouzouki like the Blues emerged from a sub culture of unemployed city dwellers persecuted by the authorities and treated as outcasts by the more prominent middle class. Their refuge was born from the small dens and coffee houses they created in the less desirable areas of the city. They found consolation in the music they created which reflected the hard times and their experiences in pain and pleasure in love and friendship.