Hi again everyone and thank you for the replies, this is a friendly and helpful forum
I will decline the invitation to define jazz as I am sure that better people than me have tried, written entire theses, and failed. Suffice it to say that if I could play a serviceable rendition of A Nightingale Sang in Berkley Square or I loves you Porgy then I would die happy.
101 Jazz and Blues Hits for Buskers seems up the right street - thank you for that. Is it arranged for accordion or do you have to construct the chords yourself?
Thanks again