has he written any other piece of music?
He edited the music of other composers like François Couperin le Grand.
Friedrich Chrysander

He also edited the music of many other composers, including (in collaboration with Johannes Brahms) the collected harpsichord music of François Couperin le Grand, published from 1871 to 1888
the most famous oratorio in the world is messiah written by Composed by George Frideric Handel,with a scriptural text compiled by Charles Jennens. when was this composed? 1741. how many parts are there in this? Three. is there a different edition of it? Yes, there exists different editions like the ones by Friedrich Chrysander and Max Seiffert , Mozart, Goossens and Andrew Davis and others. who is the first musician mentioned here? A German music historian, critic and publisher.
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Friedrich Chrysander [SEP] Biography
Born at Lübtheen, in Mecklenburg-Schwerin, Chrysander was the son of a miller. He earned a Doctorate in Philosophy from the University of Rostock in 1853. He then focused his studies on music, and in an obituary for Chrysander in October 1901, the "Musical Times" said of him that Chrysander is also credited with rediscovering the autograph score of Johann Sebastian Bach's "Mass in B Minor," which he then sold to the Royal Library in Berlin, generously doing so only for the same sum that he himself paid for it. He also edited the music of many other composers, including (in collaboration with Johannes Brahms) the collected harpsichord music of François Couperin le Grand, published from 1871 to 1888.