Music Hall maestros - songs and patter. From 1972 to 1999, Dave & Al Sealey were Cosmotheka, and performed the songs of the Music Halls. They were considered by many to be the finest interpreters of the genre and appeared at venues across the country and around the world. ​After the death of Al in 1999, Dave Sealey has returned to the stage in many collaborations, and particularly a solo career, including one-man-shows of the work of Stanley Holloway and…