We have pieces in the following keys for French Horn:
1-20 of 201 French Horn Pieces in Bb major

Trad.
Golden Slumbers

Mozart
Concerto for Flute and Harp K. 299 Mvt 2

Strauss II
Voices of Spring Waltz

Chopin
Waltz No. 1 in Eb op.18

Handel
Theme from Water Music

Trad.
When the saints go marching in

Trad.
Mango Walk (trad. Jamaican)

Faure
Pie Jesu from the Requiem

Trad.
Mexican Hat Dance (Mexico)

Chopin
A Wish

David Bruce
Freshtown Rag

David Bruce
Township Toon

Tchaikovsky
Theme from Romeo and Juliet Fantasy Overture

Schubert
Andante

Turner Layton
After You've Gone

Trad.
Old MacDonald Had a Farm

Trad.
If You're Happy And You Know It

Terry
Myn Lyking

Trad.
Girls and Boys Come Out to Play (English Trad...

Trad.
Il etait un petit navire (French Traditional...