You can find the list of solo pieces below.
Violin
Wolfgang Amadeus Mozart - Violin concerto No. 4, KV 218, in D Major, mvt. 1
Wolfgang Amadeus Mozart - Violin concerto No. 5, KV 218, in A Major, mvt. 1
Felix Mendelssohn Bartholdy - Violin concerto, Opus 64, in E Minor, mvt. 1
Max Bruch - Violin concerto, in G Minor, mvt. 1
Joseph Haydn - Violin concerto, Hob.VIIa:4, in G Major, mvt. 1
Pjotr Iljitsj Tchaikovsky - Violin concerto, Opus 35, in D Major, mvt. 1
Viola
Franz Anton Hoffmeister - Viola concerto in D Major, mvt. 1 (without cadenza)
Carl Stamitz - Viola concerto, Opus 1, in D Major, mvt. 1 (without cadenza)
Béla Bártok - Viola concerto, mvt. 1
William Walton - Viola concerto
Paul Hindemith - Der Schwanendreher
Rebecca Clarke - Sonata, mvt. 1
Cello
Joseph Haydn - Cello concerto No. 2, Hob. VIIb/2, in D Major, mvt. 1
Robert Schumann - Cello concerto, Opus 129, in A Minor, mvt. 1
Pjotr Iljitsj Tchaikovsky - Variations for cello and orchestra, Opus 33, 'Variations on a Rococo Theme', mvt. 1 to 4
Camille Saint-Saëns - Cello concerto No. 1, Opus 33, in A Minor, mvt. 1
Antonín Dvořák - Cello concerto, Opus 104, in B Minor, mvt. 1
Edward Elgar - Cello concerto, Opus 85, in E Minor, mvt. 1
Double bass
Serge Koussevitsky - Double Bass concerto, in E Minor, mvt. 1 and 2
Giovanni Bottesini - Double Bass concerto No. 2 in A Minor, mvt. 1 and 2
Carl Dittersdorf - Double Bass concerto No. 2, in D Major, mvt. 1 and 2
Johann Baptist Vanhal - Double Bass concerto, in C Major, mvt. 1 and 2
Reinhold Glière - Four Pieces, Opus 9/32, Praeludium or Intermezzo
Franz Schubert - Arpeggione Sonata, D.821, mvt. 1
Flute
Wolfgang Amadeus Mozart - Flute concerto, KV. 313, in G Major, mvt. 1
Franz Benda - Flute concerto No. 1, in E Minor, mvt. 1
Jacques Ibert - Flute concerto, mvt. 1
Henri Dutilleux - Sonatine for flute and piano
Georges Hüe - Fantaisie
Robert Muczynski - Sonata for flute and piano, Opus 14, mvt. 1
Oboe
Richard Strauss - Concerto for Oboe, in D Major, mvt. 1
Wolfgang Amadeus Mozart - Oboe concerto, K314, in C Major, mvt. 1
Joseph Haydn - Oboe concerto in C Major, mvt. 1
Bohuslav Martinu - Oboe concerto, mvt. 1
Robert Schumann - Romance, Opus 94, No. 1
Clarinet
Wolfgang Amadeus Mozart - Clarinet concerto, KV. 622, in A Major, mvt. 1
Carl Maria Von Weber - Clarinet concerto No. 1, opus 73, in F Minor, mvt. 1
Louis Spohr - Clarinet concerto No. 1, Opus 26, in C Minor, mvt. 1
Louis Spohr - Clarinet concerto No. 4, in E Major, mvt. 1
Franz Vincenz Krommer - Concerto for clarinet and orchestra, Opus 36, in E-flat Major, mvt. 1
Carl Stamitz - Clarinet concerto No. 3, in B-flat Major, mvt. 1
Bassoon
Wolfgang Amadeus Mozart - Bassoon concerto, K191, in B-flat Major, mvt. 1 and 2
Johann Nepomuk Hummel, Grand concerto, in F Major, mvt. 1
Camille Saint-Saëns - Bassoon sonata, Opus 168, in G Major, mvt. 1 and 2
Carl Maria von Weber - Bassoon concerto, Opus 75, in F major, mvt. 1 and 2
Edward Elgar - Romance for bassoon and orchestra, Opus 62
Paul Hindemith - Bassoon sonata
Alto saxophone
A solo piece of your choice
Horn
High horn
Wolfgang Amadeus Mozart - Horn concerto No. 2, KV417
Wolfgang Amadeus Mozart - Horn concerto No. 4, KV495
Richard Strauss - Horn concerto No. 1, Opus 11
Low horn
Wolfgang Amadeus Mozart - Horn concerto No. 1, KV412
Wolfgang Amadeus Mozart - Horn concerto No. 3, KV447
Hermann Neuling - Bagatelle
Trumpet
Joseph Haydn - Trumpet concerto, Hob.VIIe/1, in E-flat Major, mvt. 1 and 2
Johann Nepomuk Hummel - Trumpet concerto in E-flat Major, mvt. 1
Arthur Honegger - Intrada
George Enescu - Légende
Oskar Böhme - Trumpet concerto, Opus 18, mvt. 1
Alexander Arutunian - Trumpet concerto, in A-flat Major
Trombone
Tenor trombone
Ferdinand David - Concertino for trombone and orchestra, mvt. 1
Henri Tomasi - Concert for trombone and orchestra, mvt. 1
Eugene Bozza - Ballade
Bass trombone
Ernst Sachse - Concertino, mvt. 1
Alexander Lebedev - Concerto in one movement
Eugene Bozza - New Orleans
Tuba
Vaughan Williams - Tuba concerto, mvt. 1 and 2
Edward Gregson - Tuba concerto, mvt. 1
Richard Strauss - Horn concerto No. 1, arrangement for tuba, mvt. 1
Vladislav Blazevich - Concert etude
Bruce Broughton - Tuba sonata, mvt. 1
Johann Sebastian Bach - Flute sonata, in E-flat Major, arrangement for tuba, mvt. 1
Euphonium
A solo piece of your choice
Harp
A solo piece of your choice
Piano
A solo piece of your choice
Timpani / Percussion
No solo piece