For their "Ten Pieces" concert on 6 September, tickets are pre-booked, and people pay what they want to at the end
John Summers, the Hallé's Chief Exec, says "We wanted to do an event which would bring in a new audience, people who thought classical music was not for them or had never been to a concert hall and were kind of scared by the whole rigmarole. We are doing 10 pieces which actually start in 1700 and go through to the present day - roughly a piece every 35 years.
"We are specifically timing them so if you wanted to miss piece three and come back for piece four you'd know exactly when piece four starts.
"You can have a drink. You can go to the loo. The whole point it that people don't need to feel constrained by the normal concert etiquette.
"If they want to clap they can clap. We are also encouraging the orchestra to walk off the platform."
Some good ideas here though it does sound a bit complicated!
Read more from BBC News and from Classical Music - which includes a short promotional video made by the Hallé.
Composer Kerry Andrew wrote a response to this in The Guardian which she summarises "So hats off to the Hallé, but let’s not forget that live music is well worth the investment of our time, love and, indeed, money." - Well said Kerry!