Rooms above pubs, restaurants, student unions and galleries open their doors as impromptu venues for up-and-coming talent from across the country.
The main performances take place in St James's Church and are broadcast live online, but throughout the day music spills from pubs and impromptu venues around the town, rolling on until the early hours.
By night, some beach bars become impromptu music venues with live jazz acts and solo acoustic performances.
Crumbling houses function as impromptu music venues and galleries; an old berm is transformed into an opera stage.
For this group of old friends, assembled for an impromptu reunion, the venue would feel familiar: an online chat room running on a secure private server.
Their record shop on New Oxford Street contained a folk and blues department on the ground floor, run by Gill Cook and Hans Fried, with Ray selling jazz records from a basement which also contained his own drum kit and occasionally became the venue for impromptu sessions.
From this casual dinner came the Ynot Lot, an unsightly patch of rubble reborn as an open-air performance venue and impromptu park, with a small wooden stage and decorative murals.
Turn the clock back less than 20 years and much of the damage was still apparent, especially to music lovers who really did have to explore the underground to find the venues and impromptu establishments that kept the region's music scenes alive.
For a pre-honeymoon road trip, drive 333 miles on The Crooked Road, a corridor through the best small and large venues and impromptu musical gatherings in rural Virginia.
We decided to play a little impromptu show at a classic venue called the Bataclan.
Impromptu auto show: Outside the venue, a parade of Rolls-Royces and Bentleys sat conspicuously on the lawn.
