For years I've looked for these films and then they come all at once! Not only are they outstanding musicals but an outstanding transfer - and you get bucketloads of extras!
The films are: 42nd Street, Gold Diggers of 1933, Dames, Gold Diggers of 1935, and Footlight Parade, all with extras. There's also a sixth DVD about Busby Berkley including highlights of his films, those here and also Fashions of 1934, Wonder Bar, In Caliente, and Gold Diggers of 1937!
Of course you'll need a Region 1 DVD player and a TV that can handle US TV format (NTSC) but with these films now on DVD, go and buy one!