Brahms famous piece transcribed for 2 accordions, equal difficulty in both parts.

Air is the second movement in Johann Sebastian Bach's Orchestral Suite No. 3 in D major, BWV 1068. Originaly composed for 1st violins, 2nd violins, violas and Basso continuo.
This adaptation is for (standard bass) accordion duet. Numbering for bass is provided in the score. 

Concerto for two mandolins RV532 (Andande) was originally composed for 2 mandolins, strings, and basso continuo. This is an accordion duet arrangement.

Invention in C Major - original composition by Stas Venglevski written for two accordions.

This is a playful accordion duet with variations on the main melody. In this piece all things come in twos. There is even a slight mood change in the middle but the melody eventually returns to the familiar. There are also 2 quartet arrangements of this song, for accordion quartet as well as a quartet for 2 violins, flute, accordion.

This arrangement is for 2 accordion with bass, set of parts and with improvisation (or for 2 solo instruments). This is very famous hungarian folk song. Diese Arrangement ist f�r 2 Akkordeon mit Bass und Partituren(oder f�r 2 solo Instruments). Das ist sehr ber�hmte ungarische Volkslied. Ez a foldolgozas 2 harmonikara basszussal es partiturakkal(vagy 2 szolo hangszerre).