Dmitri Shostakovich typically catalogued his compositions and occasionally his arrangements of other composers' music with opus numbers. He began this practice with the early Scherzo in F-sharp minor and continued until the end of his life. Nevertheless, most of his juvenilia, unfinished works from his artistic maturity (such as the operas Orango and The Gamblers), and numerous completed works were left unnumbered. There were also instances when Shostakovich took an opus number assigned to one work, then gave it to another, or was undecided about the numbering of a finished composition. Further complicating the matter was an error he committed in compiling his own music in the 1930s. This led to his soundtracks for The Youth of Maxim and Girl Friends sharing the same opus number.

The table below shows an incomplete list of compositions by Richard Strauss.

Max Reger was a German composer of the late-Romantic period. His works are initially listed by Opus number (Op.), followed by works without Op. number (WoO). Other features shown are translation of titles, key, scoring, year of composition, genre, information about texts and their authors, a link to the Max-Reger-Institute, which provides detailed information about times of composition, performance and publishing, and a link to the free score when available.

The table below shows an incomplete list of compositions by Richard Strauss.

The table below shows an incomplete list of compositions by Richard Strauss.

Johannes Brahms (; German: [joˈhanəs ˈbʁaːms] ; 7 May 1833 – 3 April 1897) was a German composer, virtuoso pianist, and conductor of the mid-Romantic period. His music is noted for its rhythmic vitality and freer treatment of dissonance, often set within studied yet expressive contrapuntal textures. He adapted the traditional structures and techniques of a wide historical range of earlier composers. His œuvre includes four symphonies, four concertos, a Requiem, much chamber music, and hundreds of folk-song arrangements and Lieder, among other works for symphony orchestra, piano, organ, and choir. Born to a musical family in Hamburg, Brahms began composing and concertizing locally in his youth. He toured Central Europe as a pianist in his adulthood, premiering many of his own works and meeting Franz Liszt in Weimar. Brahms worked with Ede Reményi and Joseph Joachim, seeking Robert Schumann's approval through Joachim. He gained both Robert and Clara Schumann's support and guidance. Brahms stayed with Clara in Düsseldorf, becoming devoted to her amid Robert's insanity and institutionalization. The two remained close, lifelong friends after Robert's death. Brahms never married, perhaps in an effort to focus on his work as a musician and scholar. He was a self-conscious, sometimes severely self-critical composer. Though innovative, his music was considered relatively conservative within the polarized context of the War of the Romantics, an affair in which Brahms regretted his public involvement. His compositions were largely successful, attracting a growing circle of supporters, friends, and musicians. Eduard Hanslick celebrated them polemically as absolute music, and Hans von Bülow even cast Brahms as the successor of Johann Sebastian Bach and Ludwig van Beethoven, an idea Richard Wagner mocked. Settling in Vienna, Brahms conducted the Singakademie and Gesellschaft der Musikfreunde, programming the early and often "serious" music of his personal studies. He considered retiring from composition late in life but continued to write chamber music, especially for Richard Mühlfeld. Brahms's contributions and craftsmanship were admired by his contemporaries like Antonín Dvořák, whose music he enthusiastically supported, and a variety of later composers. Max Reger and Alexander Zemlinsky reconciled Brahms's and Wagner's often contrasted styles. So did Arnold Schoenberg, who emphasized Brahms's "progressive" side. He and Anton Webern were inspired by the intricate structural coherence of Brahms's music, including what Schoenberg termed its developing variation. It remains a staple of the concert repertoire, continuing to influence composers into the 21st century.

The table below shows an incomplete list of compositions by Richard Strauss.

The table below shows an incomplete list of compositions by Richard Strauss.