pardon me, don't know what do you want to achieve in here. i think massimo 
guide, is show the html5 player in the grid.
consider in this code :


    # tell web2py that links to music files are to be
    # represented as HTML5 audio embedded players
    from gluon.contrib.autolinks import expand_one
    db.music.filename.represent = lambda v,r: \
        XML(expand_one(URL('download',args=v),{}))

another suggestion is if you don't want to use grid, just move the code 
above in models. and then create the controller and the view it will 
automatically create the html5 audio embedded players.

best regards,
stifan

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