Joachim Raff 1822 - 1882
Joachim Raff Profile "Raff was born in Lachen in Switzerland. His father, a teacher, had fled there from Württemberg in 1810 to escape forced recruitment into the military of that southwestern German state that had to fight for Napoleon in Russia. Joachim was largely self-taught in music, studying the subject while working as a schoolmaster in Schmerikon, Schwyz and Rapperswil. He sent some of his piano compositions to Felix Mendelssohn who recommended them to Breitkopf & Härtel for publication. They were published in 1844 and received a favourable review in Robert Schumann's journal, the Neue Zeitschrift für Musik, which prompted Raff to go to Zürich and take up composition full-time.

In 1845, Raff walked to Basel to hear Franz Liszt play the piano. After a period in Stuttgart where he became friends with the conductor Hans von Bülow, he worked as Liszt's assistant at Weimar from 1850 to 1853. During this time he helped Liszt in the orchestration of several of his works, claiming to have had a major part in orchestrating the symphonic poem Tasso. In 1851, Raff's opera König Alfred was staged in Weimar, and five years later he moved to Wiesbaden where he largely devoted himself to composition. From 1878 he was the first Director of, and a teacher at, the Hoch Conservatory in Frankfurt. There he employed Clara Schumann and a number of other eminent musicians as teachers, and established a class specifically for female composers. (This was at a time when women composers were not taken very seriously.) His pupils there included Edward MacDowell and Alexander Ritter. (Raff on Wikipedia)"

Here is an excerpt from the viola part of the final movement of Raff's third symphony, "Im Walde." (In the Forest) This symphony happens to be my favorite song, and this particular movement begins with a fugue based on the theme that the viola enters with.

You can find a recording of this symphony on YouTube. Listen to "Im Walde."
Symphony Excerpt

I would also suggest that you listen to his eighth symphony, two cello concertos, and two violin concertos, if you can find recordings. There are plenty of other good pieces that he's written, but I would start with those.