Popper was a prolific composer of music for his instrument, writing four concertos, a Requiem for three cellos and orchestra (1891) and a number of smaller pieces which are still played today, including the ever-popular cello solo piece Tarantella. His shorter showpieces were written to highlight the unique sound and style native to the cello extending the instrument's range to heights with pieces such as Spinnlied (Spinning Song), Elfentanz (Dance of the Elves), or the Ungarische Rhapsodie (Hungarian Rhapsody). He also wrote instructional pieces. Popper is also famous for his High School of Cello Playing (Op. 73), a book of cello études that is used almost universally by advanced cello students.