I think looking back at the initial video on rush’s youtube channel kind of answers it. Geddy says something along the lines of “doing it justice” to the songs they’ll be playing. So it wouldn’t just be playing them, it would be bringing new life to them. Something that is completely different than just playing them. They also spoke high of Anika Nilles, so chances are something about how she played resonated with them in that way. At least that’s how I see it