Title: String Trios, Op. 9 (Beethoven)
Content: String Trio No. 3 in G major, Op. 9 No. 1 ; I. Adagio - Allegro con brio ; II. Adagio ma non tanto e cantabile ; III. Scherzo – Allegro ; IV. Presto ; String Trio No. 4 in D major, Op. 9 No. 2 ; I. Allegretto ; II. Andante quasi allegretto ; III. Menuetto – Allegro ; IV. Rondo – Allegro ; String Trio No. 5 in C minor, Op. 9 No. 3 ; I. Allegro con spirito ; II. Adagio con espressione ; III. Scherzo – Allegro molto e vivace ; IV. Finale – Presto  The three String Trios, Op. 9 were composed by Ludwig van Beethoven in 1797–98. He published them in Vienna in 1799, with a dedication to his patron Count Johann Georg von Browne (1767–1827). They were first performed by the violinist Ignaz Schuppanzigh with two colleagues from his string quartet. According to the violinist and conductor Angus Watson, these were probably Franz Weiss on viola and either Nikolaus Kraft or his father Anton on cello. Each of the trios consists of four movements:  
Title: String Trios, Op. 9 (Beethoven)
Content:  Although this opus does not contain the most played works by Beethoven it was a significant milestone in his development as a composer. At the time of publication the 28-year-old Beethoven regarded the trios as his best compositions. The trios can be seen as a part of the preparation for the upcoming string quartets, which became the leading genre among his chamber music. The musicologist Gerald Abraham has remarked that in terms of their style and aesthetic value the string trios of Op. 9 rank with Beethoven's first string quartets which ousted the trios from the concert halls. Beethoven composed no further trios after the first quartets (Op. 18) were published in 1801. Each trio is of four movements 
Title: String Trio, Op. 3 (Beethoven)
Content:  The String Trio in E-flat major, Op. 3 is a composition by Ludwig van Beethoven, his first for string trio (violin, viola and cello). It is a divertimento consisting of six movements, including two minuets. It may have been first sketched while Beethoven was still living in Bonn. It was published in 1797 by Artaria in Vienna, and dedicated to the Countess of Browne, wife of his patron Count Johann Georg von Browne.
Title: String Trios (Schubert)
Content:  Schubert started composing this piece in September 1816, but only finished the first movement. In 1890, this movement was the only content of Series VI, Trio für Streichinstrument of the Alte Gesamt-Ausgabe, and was as such republished by Dover Editions in 1965. The second unfinished movement was first published in 1897, in the first volume of the Revisionsbericht of the Alte Gesamt-Ausgabe.
Title: String trio
Content:  The concertant trio was created in France, consists of two movements, and all three voices are used equally in the texture. The first movement is usually in binary or sonata form. Giuseppe Cambini was the leading composer of the genre. Some of his works include 3 trios concertants pour violon alto et violoncelle, Op. 2 and 6 trios concertants pour Deux Violons et Basse, Op. 18.
Title: String Trio, Op. 3 (Beethoven)
Content:  The trio was arranged for cello and piano (Op. 64): this was first published in 1807 by Artaria. The arrangement is thought to be not by the composer, with Keith Anderson pointing out that Artaria's title sheet for the transcription simply implies that Beethoven was involved without explicitly stating that he was.
Title: The Dutch Trio
Content: Christian Sinding: Piano trio nr. 2 ; Philipp Scharwenka: his Piano trio opus 112 ; Eduard Behm: Piano trio op. 14 ; Hugo Kaun: Piano trio nr. 2 opus 58. Several composers have dedicated works to the Dutch Trio:
Title: String Trios (Schubert)
Content:  A few bars of an Allegro movement is all that is left of the string trio D 111A, composed in September 1814. The fragment is printed in the New Schubert Edition.
Title: String Trios (Schubert)
Content:  Schubert wrote this string trio in September 1817, and it consists of four movements. The Alte Gesamt-Ausgabe published this trio in 1897 as No. 5 in Serie XXI: Supplement, Volume 1. Both versions of this string trio were published in Series VI, Volume 6 of the New Schubert Edition in 1981.
Title: String trio
Content:  The Hausmusik trio was intended for amateurs and student musicians. It was regarded as a pedagogical tool intended as preparation for the grand trio, the brilliant trio, and the string quartet. Some examples of the Hausmusik trio include 6 Trios progressives, Op. 28 by Franz Anton Hoffmeister and 3 Trios faciles et progressives, Op. 43 by Franz Alexander Pössinger.

Question: Who was the composer of String Trios, Op. 9?
Answer: Ludwig van Beethoven.
Beethoven.
L. van Beethoven.
Ludvig van Beethoven.
Ludwig Van Beethoven.
L. Bethovenas.
Ludwik van Beethoven.
Louis van Beethoven.
L. v. Beethoven.
L. van Betkhoven.