 You're listening to Broadway's My Beat, written by Morton Fine and David Friedkin with Larry Thor as Detective Danny Clover. Tonight's the night. Yes, beginning this evening, there'll be a new host on Songs for Sale. He's affable Steve Allen, a young comedian whose likable personality you're really going to enjoy. Steve Allen becomes head salesman on Songs for Sale, introducing new songwriters and their tunes tonight over most of these same CBS stations.