Hi Rosa, you left a message at On the Sunny Side of the Street by Tommy Dorsey, asking if the vocalists were the Andrew Sisters. The answer is no. There are two great vocal groups that recorded with Dorsey: The Pied Pipers (with a young Frank Sinatra and Jo Stafford) and "The Sentimentalists" aka The Clark Sisters. So on this song you hear The Clark Sisters.
Regards from Amsterdam, Holland