Hey there I was wondering if anyone could help me out. I need to know the best first book the get for playing a 20 button anglo concertina. I have had mine for a few months now and can play some songs. I realy want to learn some proper technique and most importantly of all I want to know my chords and be able to play the bass lines along with the melody. What book or video or whatnot would you all recomend for me??