Mozart 12 short pieces, Piano Solo, with downloadable mp3 files just for audio help, intermediate, 21 pages.

Moderato in C Major op.3 by C.M. Weber (1786-1826) piano solo, 2 pages, 40 measures, 1:30 min, with downloadable mp3 for audio help, easy to early intermediate.

The String Quartet No. 21 in D major, K. 575, was written in June 1789 by Wolfgang Amadeus Mozart.
Here is an arrangement for Cello and Piano for the third Movement (menuetto and trio).

With downloadable mp3 for audio help.
Eleven pages (5 pages both Cello and Piano, 3 pages Piano part, 3 pages Cello part), 6:30' min.

Intermediate.
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also check:
Air de Rinaldo Cello Piano duet : SheetMusicPlus number 20448368
Adagio Cantabille op13 Beethoven Cello Piano duet : SheetMusicPlus number 20447640
A minuet sonatine for Cello and Piano duet pdf mp3 : SheetMusicPlus number 20069947

A romantic and bittersweet solo piano by the great Ernestho Nazareth.
Easy to early-intermediate piano solo with some piano fingering suggestions.
With downloadable mp3 just for audio help.
Pages: Three (3) pages, 40 measures, 1:45 min.

Melodie by F. Schubert (1797-1828)  for easy to early intermediate piano.

With finger position suggestions. With downloadable mp3 just for audio-help.
Pages: 2 pages, 2:17' min.