Weingartner edited, with Charles Malherbe, the complete works of Hector Berlioz (he once called Berlioz the "creator of the modern orchestra") as well as the operas "Joseph" by Méhul and "Oberon" by Weber, and individual works of Gluck, Wagner and others. He also made orchestral versions of piano works such as Beethoven's "Hammerklavier" Sonata, Weber's "Invitation to the Dance", and Bizet's "Variations chromatiques". Before Brian Newbould's more recent work, in 1934, he made a performing version of Schubert's Symphony No. 7 in E major, D. 729, that has received some performances and recordings; he also arranged works by a number of early Romantic masters for orchestral performance.