The feud between singers Wayne Newton and Tony Orlando has hit another sour note. Last year the performers shared what was then the Talk of the T.O.W.N. Theater in Branson, Mo., until Newton, whose company leased the building, allegedly locked Orlando out, saying Orlando owed him more than $2 million. In April Orlando sued Newton in federal court, claiming the lockout cost him $125,000 from 11 canceled shows last year and millions more in projected earnings over the next two seasons. Newton countersued on Monday, seeking more than $20 million in damages. His suit disputes Orlando’s account and accuses him of spreading false claims in the news media.