Skylark is an American popular song with lyrics by Johnny Mercer and music by Hoagy Carmichael, published in 1941.
Here is an arrangement for Flute (plays the melody) and Piano duet.
With lyrics, guitar chords and melody line. With downloadable simple mp3 for practice the flute.
Flute early intermediate. Piano advanced Intermediate.
Five pages (4 pages both Flute and Piano, 1 page Flute), 2:20' min.

Barcarolle by F.Schubert for Flute and piano duet, 10 pages (7 pages flute and piano score, 3 pages flute solo) 2:25 min, with downloadable mp3 just for audio help.

Ave Maria for FLUTE and Piano Duet.
9 pages (7 pages both piano and flute, 2 pages flute part).
5:50 min, widh downloadable mp3 for audio help.

Mazurka op.6 No.1 by Frederic Chopin for piano and flute duet or piano and violin duet. Simplified piano.
With downloadable mp3 for audio help.
Pages: Seven pages (piano and flute 5 pages, Flute part 2 pages), 3' min.