We have pieces in the following keys for Cello Trio:
1-8 of 8 Cello Trio Pieces in C major

Corelli
Christmas Concerto Op 6 No. 8, Pastorale

Mozart
Confutatis Maledictis from Requiem K. 626

Haydn
Theme from Surprise Symphony, No. 94 2nd mvt

Denza
Funiculi - Funicula

Bruckner
Aequale No. 1 WAB 114

Trad.
Blue Bells of Scotland

Bach
Air on the G string

Trad.
Carrickfergus