Choirs from across NSW and interstate will pop up around the city with jazz, blues and pop tunes for 50 performances at 13 venues including cafes, North Beach and the Arts Precinct. Plus watch out for a 300 voice flash mob during the three-day event.

“Typically choral festivals will have choirs performing to a given audience in a hall and I haven't done that, I really wanted to take the performances out to community,” founder Louise Meyrick said.

Cabaret quartet Lady Sings It Better join human beat-boxers Suade Vocaltronics as the headliners, performing at a ticketed concert at Wollongong Town Hall.

Fifteen community choirs and five school choirs will take part, most of them curated without audition. This means their members vocal ability may vary but Ms Meyrick believes many people will be surprised by the sound quality these groups produce.

“Choirs attract a lot of people who just want to participate that don’t have the competence or confidence to do it by themselves and they become excellent,” she said.

The festival began in 2013 thanks for Ms Meyrick’s passion to celebrate and share a cappella music with the community at large.