How did Franz Liszt popularize the music of other composers?

Franz Liszt encouraged the performance of the music of Johannes Sebastian Bach, Ludwig van Beethoven, Hector Berlioz, and others by transcribing their works for piano and playing them at a time when their music was underappreciated. He wrote books on Frédéric Chopin, Richard Wagner’s Lohengrin and Tannhäuser, and John Field’s nocturnes.