Warner Baxter again heads the cast of a Hollywood musical extravaganza of the sort which is steadily encroaching upon the field once monopolized by Florenz Ziegfeld and George White on the legitimate stage. The show is "Stand Up and Cheer" at the Keith's Memorial Theatre on Tremont Street.

In addition to the genial Mr. Baxter are Madge Evans, the irrepressible James Dunn, Sylvia Froos, operatic John Boles, Nigel Bruce, Arthur Byron, and an attractive curly-headed youngster named Shirley Temple.

It is naturally a great strain on the Hollywood song writers to keep on producing hits, and if they fail to do so on one or two occasions, they can hardly be condemned as any worse than human. There is Mr. Bing Crosby, Baxter, Vallee, and several others who appear periodically in films which should have song hits. Mr. Baxter had the best luck of all when he started out in "42nd Street." Mr. Crosby has also been awarded a number of highly acceptable tunes such as "Please," "Love Thy Neighbor," "Here Lies Love." "Stand Up and Cheer" is equipped with pleasant orchestrations and ranks about a B-- on music.

For plot and action no one seems to care particularly, but there are spectacles in profusion. Jimmy Durante is apparently past his zenith, his part is comparatively small.

Mr. Baxter is still waiting patiently for another perfect part, but he seems to wait pleasantly and forgivingly.