What was the name of the inhabitants for the northern, southern, and western areas of former Czechoslovakia where  a German composerknown by his Czech name Jan Josef Abert  is from? 
Johann Joseph Abert:  An ethnic German from the Sudetenland, he is also known by his Czech name Jan Josef Abert. Sudetenland: The Sudetenland ( ; ] ; Czech and Slovak: "Sudety" ; Polish: "Kraj Sudecki" ) is the name for the northern, southern, and western areas of former Czechoslovakia which were inhabited primarily by Sudeten Germans.
Sudeten Germans