Order of the Court (Ninth Chamber) of 6 May 2021.#OM v Ministero dell'Istruzione, dell'Università e della Ricerca - MIUR and Others.#Reference for a preliminary ruling – Article 53(2) of the Rules of Procedure of the Court of Justice – Reference for a preliminary ruling on the validity of a provision of the FEU Treaty – Clear lack of jurisdiction of the Court – Freedom of movement for workers – Equal treatment – Article 45 TFEU – Difference in status and salary between university teachers and teachers working in the art and music higher education national system – Purely internal situation