|| (prop == ly_symbol2scm ("element") && unsmob_music (val))
|| (prop == ly_symbol2scm ("elements") && scm_is_pair (val))
|| (prop == ly_symbol2scm ("pitch-alist") && scm_is_pair (val)))
|| (prop == ly_symbol2scm ("element") && unsmob_music (val))
|| (prop == ly_symbol2scm ("elements") && scm_is_pair (val))
|| (prop == ly_symbol2scm ("pitch-alist") && scm_is_pair (val)))