What other concerti are there which would be less difficult than Der Schwanendreher, for example, but more difficult than those mentioned above?
Many early and mid-20th century works can fill in this gap; whether each is less difficult than Schwanendreher is debatable, but they offer different types of difficulties and important preparation for Schwanendreher, Walton & Bartok in repertoire not likely to be crucial for future audition purposes. These include the concerti by Gyula David, Piston, Porter, Serly, Bloch (both Suites), Martinu, Bowen, Dale, Bax, Benjamin, Antiufeyev, to name a few. Everything listed above has been in print at some time in the past thirty years, and many are currently available. Most works are available in the U.S. through OCLC inter-library loan (a service of many public and most university libraries), and there is a similar computerized library system in Europe.