 At least one also mentions his ability to keep absolute tempo, which may be caused by his father's insistence to practice with a metronome.His repertoire then consisted primarily of pieces in the style of the brilliant Viennese school, such as concertos by Hummel and works by his former teacher Czerny, and his concerts often included a chance for the boy to display his prowess in improvisation.Liszt possessed notable sight-reading skills.