Ah, the eternal question: to clap, or not to clap between movements? The debate has been rekindled at the BBC Proms in London this summer. Some audience members are applauding between movements without being shushed by their neighbors, and according to some observers, they're eliciting pleasure from musicians on stage. We'll hear two examples from concerts last week. The Royal Liverpool Philharmonic played the first two movements from Tchaikovsky's Manfred Symphony, and got applause after both. Pianist Paul Lewis and the BBC Symphony got applause after the first and last movements of Beethoven's Piano Concerto No. 4. And feel free to clap for composer Bruce Adolphe, who has a brand new Piano Puzzler this week.