That was a setting by Paul Inwood in the St Thomas More Centre collection Lord, by your cross and resurrection (1977). The reason it had Alleluias was because it was designed for use in a re-ordered Vigil where the fire was blessed, the readings and chants between them took place in the light of the fire, then the Paschal Candle was blessed just before the Gospel, so the A-word had already been heard by the time the Exsultet was sung after the Gospel.Hare wrote: ↑Wed Mar 30, 2022 6:14 am One PP once asked for a version with responses that he'd heard elsewhere (can't remember who it was by) IIRC there was an instruction in it that the cantor raised an arm when they reached the phrase that the assembly were supposed to repeat. I seem to remember that it went quite well, although I was uneasy as the text incorporated Alleluias - which of course should not feature at that point in the Vigil liturgy.
Back then, the rationale for moving things around was a perception that we have all that wonderful symbolism of fire, grains of incense, the candle, etc, and then, in effect, we say "Now let's sit down and find out why we did all that". Having salvation history in the readings and then an explosion of light and joy associated with the Resurrection Gospel seemed like a more logical progression.
While we might not do that kind of thing today, the idea of having assembly responses to enhance participation in an otherwise lengthy sung monologue where everyone is standing, trying not to drip candle-wax on their neighbours, is perhaps not entirely dead.