There are some 150 stamps related to the theme of Johann Sebastian Bach all over the world. Plus, there are so called cinderellas. What cinderellas are, is what you find out, when you click to the chapter about Bach stamps.
The country, that released the most Bach stamps, is Germany. Probably because for three decades both Western Germany and Eastern Germany celebrated anniversaries and Bach years with issuing Bach stamps. One of the most exotic stamps with a whole different musical culture, which published a Bach stamp is China. In India, Arabia, and very often in Africa Bach stamps have been published too.