hmmmm, books with melody and chord markings sound like either books for melody instruments such as flute or violin, or "fakebooks" for players who can just look at the melody and chords and arrange on the spot. the mel bay publishers have some good books of accordion music from various cool world genres....a couple of french musette books, a french cafe accordion set by dan newton, and a title "international accordion favorites" which has some tango, some eastern europe, etc. the Kaminer series of international folk stuff (lots of eastern europe, gypsy) is also great. you can alter/simply/adapt as you like, and learn a lot about arranging and how left/right are broken down, while you're at it.
the other resource that could be great are the books in the palmer-hughes progressive-graded accordion course. the pieces in these include a lot of schlock (well, unless you love john philip sousa), but also include great folk or folk-inspired waltzes, tangos, etc., and some international folk-influenced classical pieces, hungarian dances, russian dances, etc. those books are great for learning to arrange on duet concertina because piano accordion's left side buttons are not only chords. there are 2 rows of single notes. and these books teach and show counterpoint, harmony, or walking bass using the single-note buttons.
Edited by ceemonster, 15 January 2015 - 06:01 AM.