Question: Of the two composers, Giovanni Paisiello or Carl Maria von Weber, which was of the Classical Era?

Context paragraphs:
Symphony No. 1 (Weber): Carl Maria von Weber's Symphony No. 1 in C was written in 1806–1807.  While not usually acknowledged as among Weber's greatest works (a fact readily admitted by Weber himself), it is a testament to the young composer's gift of melody.

Grand Duo Concertant (Weber): The Grand Duo Concertant, Opus 48, J204, is a three-movement work for clarinet and piano composed by Carl Maria von Weber from 1815 to 1816.  It is a virtuosic piece for both instruments.  Weber most likely composed the work for himself (on piano) and his friend Heinrich Baermann, a leading clarinettist of the era, although it has also been suggested that the intended clarinettist was Johann Simon Hermstedt.

Clarinet Quintet (Weber): The Clarinet Quintet in B♭ Major, Op. 34, is a clarinet quintet that was composed by Carl Maria von Weber from 1811 to 1815.  Like with most of Weber's other clarinet compositions, the quintet was written for the German clarinet virtuoso Heinrich Baermann.

Hochschule für Musik Carl Maria von Weber: The "Carl Maria von Weber" College of Music (Hochschule für Musik "Carl Maria von Weber" in German, and also/formerly known as Dresden Conservatory or Dresden Royal Conservatory) is a college of music in Dresden, Germany.

Euryanthe: Euryanthe is a German "grand, heroic, romantic" opera by Carl Maria von Weber, first performed at the Theater am Kärntnertor, Vienna on 25 October 1823.  Though acknowledged as one of Weber's most important operas, the work is rarely staged because of the weak libretto by Helmina von Chézy (who, incidentally, was also the author of the failed play "Rosamunde", for which Franz Schubert wrote music).  "Euryanthe" is based on the 13th-century romance ""L'Histoire du très-noble et chevalereux prince Gérard, comte de Nevers et la très-virtueuse et très chaste princesse Euriant de Savoye, sa mye.""

Carl Maria von Weber: Carl Maria Friedrich Ernst von Weber (18 or 19 November 1786 5 June 1826) was a German composer, conductor, pianist, guitarist and critic, and was one of the first significant composers of the Romantic school.

Giovanni Valesi: Giovanni Valesi (born Johann Evangelist Wallishauser, Walleshauser or Wellesberger; pseudonym also spelled Walesi or Vallesi) (28 April 1735, Hattenhofen – 10 January 1816, Munich) was a German tenor.  In 1756 he entered the service of Duke Clemens Franz at Munich and was sent to Italy for training.  A court singer at Munich from 1770 to 1798, he took part in the first performances of Mozart's "La finta giardiniera" and "Idomeneo re di Creta".  Afterwards, he took up teaching.  His pupils included Johann Valentin Adamberger, Carl Maria von Weber, and his five children, born from his marriage in 1775 to Leni Mindl.

Silvana (opera): Silvana, J. 87, is an opera by Carl Maria von Weber, first performed in Frankfurt am Main on 16 September 1810.  The libretto, by , is a reworking of an earlier, unsuccessful opera by Weber, "Das Waldmädchen ".  Weber also reused music from the same piece in "Silvana".

Giovanni Paisiello: Giovanni Paisiello (or Paesiello; 9 May 1740 – 5 June 1816) was an Italian composer of the Classical era.

Bassoon Concerto (Weber): Carl Maria von Weber's Concerto for Bassoon in F Major, Op. 75 (J. 127) was composed in 1811 for Munich court musician Georg Friedrich Brandt, and then revised in 1822.  Primarily an opera conductor and composer, Weber had only arrived a few months earlier in Munich, where he was extremely well received.  The concerto is one of two pieces written for bassoon by Weber, the other being "Andante e Rondo Ungarese", Op. 35 (J. 158).  A typical performance lasts 18–20 minutes.

Supporting paragraphs: Carl Maria von Weber Giovanni Paisiello
Answer: Giovanni Paisiello