As a trained bass baritone, animal activist Mark Pearson often sings the operas of Mozart and Wagner to renew his spirits and put aside the horrors he sees inflicted on other sentient beings.

After unexpectedly nabbing a spot in NSW Parliament for the Animal Justice Party on Friday, Mr Pearson suddenly has a much bigger audience for his political agenda – and perhaps even his music.

A strong voice for animal rights: New upper house MP Mark Pearson. Credit:Max Mason-Hubers

"I often sing. It's a hobby but I also do recitals for various charities … it's a healing thing for the mind, particularly when you're working in an area where you're seeing a lot of suffering and torment," he said, adding: "I might sing a few songs in Parliament."

Mr Pearson, 55, secured the 21st and final spot in the upper house after preferences were electronically distributed.