http://www.nationalgalleries.org/visit/page/2:140:2
Open daily, 10am-5pm (6pm for August only). Thursdays until 7pm
There are two cafés off the foyer of the National Gallery of Scotland. The larger of the two, the Scottish Café and Restaurant, does play piped music. However, there is a smaller one called the Garden Café (situated in the Gardens entrance) which is musac-free. The coffee is good and they have a variety of cakes and pastries. If you are lucky, you can get a table with a pleasant view of Princes Street Gardens