Johann Baptist Wanhal Johann Baptist Wanhal (May 12, 1739 – August 20, 1813 /74세), was an important Czech classical music composer. He was born in Nechanice, Bohemia, and died in Vienna. His music was well respected by Mozart , Haydn and Beethoven. String Quartet F Major Op. 6, No.1 String Quartet E flat Major Op 13,No.1 String Quartet E Major Op. 6, No.2 String Quartet G ..