 These works helped establish the genre of orchestral program music—compositions written to illustrate an extra-musical plan derived from a play, poem, painting or work of nature.They inspired the symphonic poems of Bedřich Smetana, Antonín Dvořák, Richard Strauss and others.Liszt's intent, according to musicologist Hugh MacDonald, was for these single-movement works "to display the traditional logic of symphonic thought."