Baron Hans Guido von Bülow (January 8, 1830 – February 12, 1894) was a German conductor, virtuoso pianist, and composer of the Romantic era. One of the most famous conductors of the 19th century, his activity was critical for establishing the successes of several major composers of the time, especially Richard Wagner and Johannes Brahms. Alongside Carl Tausig, Bülow was perhaps the most prominent of the early students of Hungarian virtuoso pianist, conductor and composer Franz Liszt – therein performed the first public performance of Liszt's Sonata in B minor in 1857. He became acquainted with, fell in love and eventually married Liszt's daughter Cosima, who later left him for Wagner. Noted for his interpretation of the works of Ludwig van Beethoven, he was one of the earliest European musicians to tour the United States.
Bülow was born in Dresden, to members of the prominent Bülow family. From the age of nine, he was a student of Friedrich Wieck (the father of Clara Schumann). However, his parents insisted that he study law instead of music, and they sent him to Leipzig. There he met Franz Liszt, and on hearing some music of Richard Wagner—specifically, the premiere of Lohengrin in 1850—he decided to ignore the dictates of his parents and make himself a career in music instead. He studied the piano in Leipzig with the famous pedagogue Louis Plaidy. He obtained his first conducting job in Zurich, on Wagner's recommendation, in 1850.