Swift, 34, has occupied the top of the Billboard 200 for the past four weeks with her blockbuster new album, 'The Tortured Poets Department,' which has earned more than 3.6 million equivalent album sales. But Eilish’s well-reviewed new album, 'Hit Me Hard and Soft,' is challenging for No. 1 in its debut, as its 10 songs prove popular on streaming services like Spotify