"Frühlingsstimmen" was written by a composer known by what nickname?
Frühlingsstimmen:  410 ("Spring's Voices," or commonly "Voices of Spring") is an orchestral waltz, with optional solo soprano voice, written in 1882 by Johann Strauss II. Johann Strauss II:  In his lifetime, he was known as "The Waltz King", and was largely then responsible for the popularity of the waltz in Vienna during the 19th century.
"The Waltz King"