Michael Praetorius ( born Creuzburg an der Werra , near Eisenach 15 February 1571 ? ; died WolfenbÃ 1\/4 ttel , 15 February 1621 ) was a German composer , organist and music theorist . Michael Praetorius ( probably February 15 , 1571 -- February 15 , 1621 ) was a German composer , organist , and writer about music .