Ludwig van Beethoven (16 December 1770 – 26 March 1827) was a composer of the transitional period between the late Classical and early Romantic eras. He was born in Bonn, Germany.

Beethoven is widely regarded as one of the greatest masters of musical construction, sometimes sketching the architecture of a movement before he had decided upon the subject matter. He was one of the first composers to systematically and consistently use interlocking thematic devices, or “germ-motives”, to achieve unity between movements in long compositions. (Some insight into the meaning of the germ-motive device is given at the end of this bio.) Equally remarkable was his use of “source-motives”, which recurred in many different compositions and lent some unity to his life’s work. He made innovations in almost every form of music he touched. For example, he diversified even the well-crystallized form the rondo, making it more elastic and spacious, which brought it closer to sonata form. He was mostly inspired by the natural course of nature, and liked to write songs describing nature.

Beethoven composed in a great variety of genres, including symphonies, concerti, piano sonatas, other instrumental sonatas (including for violin), string quartets and other chamber music, masses, lieder, and one opera.

Beethoven's compositional career is usually divided into Early, Middle, and Late periods:

In the Early (Classical) period, he is seen as emulating his great predecessors Haydn and Mozart, while concurrently exploring new directions and gradually expanding the scope and ambition of his work. Some important pieces from the Early period are the first and second symphonies, the first six string quartets, the first three piano concertos, and the first twenty piano sonatas, including the famous "Pathétique" and "Moonlight" sonatas.

The Middle (Heroic) period began shortly after Beethoven's personal crisis centering around his encroaching deafness. The period is noted for large-scale works expressing heroism and struggle; these include many of the most famous works of classical music. Middle period works include six symphonies (numbers 3 to 8), the fourth and fifth piano concertos, the triple concerto and violin concerto, five string quartets (numbers 7 to 11), the next seven piano sonatas (including the "Waldstein" and the "Appassionata"), and Beethoven's only opera, Fidelio.

Beethoven's Late (Romantic) period began around 1816. The Late-period works are characterized by intellectual depth, intense and highly personal expression, and formal innovation (for example, the Op. 131 string quartet has seven linked movements, and the Ninth Symphony adds choral forces to the orchestra in the last movement). Many people in his time period do not think these works measured up to his first few symphonies, and his works with J. Reinhold were frowned upon. Works of this period also include the Missa Solemnis, the last five string quartets, and the last five piano sonatas.

Destructuring the sonata form, both in the overall schema (movements, tempos) and in the micro-form, Beethoven began to use germinal ideas propelling the whole melodic, harmonic, and rhythmic progression. In the first quartet of the group (E flat major, Op.127 – Feb. 1825), the Adagio has 5 variations (in this case, a source-theme becomes the backbone of the tempo). That same year, in July, Quartet in A minor, Op.132, features a first movement with the traditional two themes, but without contrast; they display and disseminate sub-sections and ‘germs’ in a circular frame, interlocking with each other. Beethoven's germ-motive is like a Bach choral, summoning the other voices around itself.

The last quartet, Op. 135 in F major, was composed in a downplayed form, going back to a more traditional 4-tempo structure. But internally one finds the same frozen micro-structure: the first movement is harmonically ambiguous, whereas the scherzo sounds like Bartòk, and in the finale, the canon ‘Es muss sein’ plays a joyful role. A terrible grave comes in afterward, to dissolve into a soft pizzicato: adieu music, adieu life . It was never heard by the now deaf Beethoven, and he died shortly afterward.

Insight on idea of the germ-motive thematic device, definitions from 1913 Webster's:

2. That which incites to action; anything prompting or exciting to choice, or moving the will; cause; reason; inducement; object; motivation[2]. [1913 Webster]

By motive, I mean the whole of that which moves, excites, or invites the mind to volition, whether that be one thing singly, or many things conjunctively. --J. Edwards.

3. (Mus.) The theme or subject; a leading phrase or passage which is reproduced and varied through the course of a comor a movement; a short figure, or melodic germ, out of which a whole movement is developed. See also Leading motive, under Leading. [Written also motivo.]

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