一首失传已久的协奏曲曾经被认为是斯佩尔格的作品，现在被确认为普莱耶尔的协奏曲，将于 2026 年首演。 A long-lost concerto, once attributed to Sperger, is now confirmed as Pleyel’s and will premiere in 2026.

一个失落的古典协奏曲“Concerto per Violone”, 原由约翰尼斯·斯珀格(Johannes Sperger)撰写, A lost classical concerto, "Concerto per Violone," originally thought to be by Johannes Sperger, has been rediscovered and attributed to Ignaz Joseph Pleyel, a prominent contemporary composer. 2026年10月将与澳大利亚勃兰登堡管弦乐团举行首映式。 The piece, written for a five-stringed Viennese double bass and a typical early 19th-century orchestra, will premiere in October 2026 with the Australian Brandenburg Orchestra. 音乐学家Darija Andzakovic认为Pleyel是真正的作曲家, 将笔迹与他已知的手稿匹配。 Musicologist Darija Andzakovic identified Pleyel as the true composer by matching handwriting to his known manuscripts. 该协奏会可能是在Pressburg(现为布拉迪斯拉发州)上演的,但没有被听到,因为其最初组成和带有编辑标志,表明两个作曲家之间有协作关系。 The concerto, possibly performed in Pressburg (now Bratislava), has not been heard since its original composition and features editorial markings suggesting collaboration between the two composers.