for those unable to or not wishing to have formal lessons I recommend mel bays ''you can teach yourself accordion'' starts right at the beginning, includes a CD . covers basic theory but not too much and has a nice range of tunes particularly for those wanting to play a range of ''jolly tunes'' rather than following the classical exams and grades route.
tunes include a bit of everything eg ode to joy, brahms lullaby, jambaaya, two stepping 'cross texas, riskc reel, pretty fair maid jig, lake Charles waltz (Cajun), Chinatown, wahington and lee swing, british grenadiers, melancholy baby, amazing grae etc etc etc.
george