Johann Nepomuk Hummel
Johann Nepomuk Hummel (1778-1837) was an Austrian pianist and composer. As a virtuoso himself, much of his music is for piano or at least includes substantial piano parts.
This website includes accompaniment tracks for Hummels three flute sonatas, his Fantasie (Potpourri) for viola and his famous Trumpet Concerto which is a staple of the repertoire. Links can be found below.