Arnold grew up on his parent's estate in Sontheim in the Kingdom of Württemberg. From an early age on, he received instruction in music from his father, a music director. He studied theology and philosophy in Tübingen and Freiburg and received his doctoral degree in 1832. His professional life began in Cologne where he worked as a feuilleton editor, a theater and opera critic, choir director of the German Opera and as dramatic advisor. Between 1835 and 1840 he was director and co-owner of Eck & Comp., a music publisher and supplier in Cologne. During this period Arnold also wrote historical short stories and, between 1835 and 1841, published several as novellas. He also prepared a number of volumes of the music periodical "Pfennig-Magazin für Gesang und Guitarre" as well as publishing his own arrangements for guitar, piano and violin. In 1836 he married Maria Henriette Amalia Frambach, daughter of the director of public finances of the city of Cologne Johann Heinrich Frambach. The couple had three children: Ursula, Jakob and Agnes. Ursula, also known as Lina, received piano instruction from Clara Schumann and Johannes Brahms, with both of whom she maintained contact throughout her life. Jakob, who also went by the name Emil, took over his father's business after his death. In 1841 Arnold moved to Elberfeld, founded his own music business and, seven years later, a music publishing house. He published over 700 works, including pieces by Ludwig van Beethoven, Franz Liszt, Felix Mendelssohn Bartholdy, Wolfgang Amadeus Mozart, Robert Schumann and Franz Schubert. He had business relations and personal contact to several contemporary composers including Robert and Clara Schumann as well as Johannes Brahms. As of 1850 Arnold was increasingly occupied with research on the German folk-song. In this he collaborated with like-minded scholars such as Philipp Wackernagel, Anton Wilhelm von Zuccalmaglio, Karl Simrock, Johannes Brahms and Ludwig Uhland. One outcome of his extensive research was his folk-song collection "Deutsche Volkslieder aus alter und neuer Zeit" which was published posthumously. In the late 1850s Arnold gained access to the "Locheimer Liederbuch", a manuscript with songs from the late Middle Ages to the early Renaissance, which he began to edit. In 1863 the editor of the "Jahrbücher für musikalische Wissenschaft", Friedrich Chrysander, invited Arnold to submit this work for publication. Shortly before his death on February 12, 1810, resulting from a stroke, Arnold sent his manuscript to Chrysander. After a revision by Heinrich Bellermann, the Arnold edition was published in the Jahrbücher in 1867.
Works
Novellas
Der Virtuose aus Genua. In: Hell T. Penelope. Taschenbuch für das Jahr 1835, Vol. 24. Leipzig, JC Hinrichsche Buchhandlung. 1835, 227–353.
Der Chouan. Historische Novelle aus dem letzten Dezennium. Leipzig, Chr. E. Kollmann. 1841, 388 pp.
Der Virtuose aus Genua. Die Sternauer. Leipzig, Chr. E. Kollmann. 1841, 301 pp.
Die Blutbrücke, 'Der Geächtete, Das Nebelmännchen. Leipzig, Chr. E. Kollmann. 1841, 354 pp.
Editor
Pfennig-Magazin für Gesang und Guitarre. Köln, Gaul & Tonger, 1834-5. Later: HEBE ein Pfennig-Magazin für Freunde und Freundinnen des Gesanges und der Guitarre. Köln, Gaul & Tonger, 1837, 1838, 1839.
Arnold FW. Deutsche Volkslieder, aus alter und neuer Zeit gesammelt und mit Clavierbegleitung versehen. Elberfeld, Arnold. 1864–1871: Heft 1–9.