Which composer's first symphony has been nicknamed "Beethoven's Tenth Symphony"?

Ludwig van Beethoven (1770 – 1827) completed nine symphonies: the first premiered in 1800 and the ninth in 1824. There is consensus among musical historians that Beethoven intended to compose another symphony and he left sketch notes that were clearly intended for this projected symphony.

Beethoven’s works were hugely influential. One of the composers who were acutely conscious of this influence was Johannes Brahms (1833 – 1897). Brahms claimed that his Symphony No. 1 in C minor, Op. 68, took 21 years to complete, from the first sketches in 1855 to its premiere on 4 November 1876, in Karlsruhe. The long gestation of this symphony is attributed to two factors. First, Brahms was highly self-critical and destroyed or rewrote many of his early works. Second, there was an expectation from Brahms's friends and the public that he would continue "Beethoven's inheritance" and produce a symphony of commensurate dignity and intellectual scope – an expectation that Brahms felt he could not fulfil easily in view of the monumental reputation of Beethoven.

The importance of Brahms's achievement in his First Symphony was widely recognised. The conductor Hans von Bülow was moved in 1877 to call the symphony "Beethoven's Tenth", due to perceived similarities between the work and various compositions of Beethoven. It is often remarked that there is a resemblance between the main theme of the finale of Brahms's First Symphony and the main theme of the finale of Beethoven's Ninth Symphony.