Trembling Bells/Mike Heron

Mixing up British folk of the ’60s with post-rock, Trembling Bells is the atmospheric, sometimes psychedelic and frequently blistering project of drummer Alex Neilson. He fronts the band from the rear of the stage while guitarist Lavinia Blackwall takes the lion's share of vocal duties with her soaring, classy soprano. They're collaborating tonight with The Incredible String Band's Mike Heron. For those about to baroque…