McLeod's Daughters star Lisa Chappell said Webb was a shining example for young performers to look up to.
"Jan is an exceptional teacher, friend and human being."
Webb, a former singer and performer, said it was her love of the vocal instrument that put her on the teaching path.
"The voice is the only instrument you have to build, the only one you can't buy another of and the only one you can't see. It's unique to each of us — it is soul-baring, and I love it."
Webb added that she was humbled at being honoured by so many of her former students for their 70th.
"I am blown away that all of these people have re-scheduled their very busy lives and careers to come and perform at this event."