for (; scm_is_pair (check_funcs); check_funcs = scm_cdr (check_funcs))
music = scm_call_2 (scm_car (check_funcs), music, parser);
for (; scm_is_pair (check_funcs); check_funcs = scm_cdr (check_funcs))
music = scm_call_2 (scm_car (check_funcs), music, parser);