"This musical phrase (called variously neuma, jubilatio, jubilus, cantilena) is a very old and essential element of the Alleluia."
"'Moris enim fuit, ut post Alleluia cantaretur neuma; nominatur autem neuma cantus qui sequebatur Alleluia.'"
"Towards the end of the neuma on tuam (where in the MS. the neums surmount the second syllable) the staff notation substitutes a pes subbipunctis for a virga and climacus – a mere graphic difference."