The master classes, especially, demonstrated the process and mechanism of singing.
One of the tutors, Professor Paul Farrington, told her he visualised what was happening in the singers' voice boxes as he worked with them.
Last year, Priest painted the portrait of student countertenor Stephen Diaz, and he sang while she worked.
"The house was just ringing with the sound, and that definitely informed the painting," she said.
Her aim was to capture the power and energy in the moment.
"The live sitting is very much a response to everything that's happening in the moment, and it's not just a visual thing," she said.
Priest has been interested in the relationship between sound and vision since her student days, and wrote her art school thesis on it.
"I've had singing lessons in the past, and I'm very interested in the process. Opera is a very complex art form, and this is my way, as a visual artist, of exploring it."
After absorbing all those sights, sounds and interactions in 2011, Priest wants push the subject further.
"A longer-term project might be bringing the two art forms together in some way, like a performance piece. This is the first step.
"I'm moving toward the fusion. I've got no plan, I'm just doing it."
When the project has gelled, she'd like to have a show in Auckland, Wellington and also in Australia.