Music: Streamlined Music

A smart, brisk little practitioner of radio and cinema music is Andre (''Kosty") Kostelanetz, who once was assistant conductor in the Imperial Opera in St. Petersburg, left his native land after the revolution to become U. S. accompanist to a number of second-string opera singers. For seven years, Kostelanetz has been a radio conductor, has had his name linked frequently with that of Soprano Lily Pons since he led the orchestra in her first two pictures (I Dream Too Much, That Girl From Paris). Commuting last year between Hollywood and Manhattan by airplane, "Kosty" flew 126,000 miles, earned from four...