D: Roy Del Ruth. Jack Benny, Eleanor Powell, Robert Taylor, Una Merkel, Sid Silvers, Buddy Ebsen. Pleasant musi- comedy with Winchell-like columnist Benny trying to frame producer Taylor via dancer Powell, whose solo spots are pure delight. Arthur FreedNacio Herb Brown songs: ``You Are My Lucky Star,'' ``Broadway Rhythm,'' ``I've Got a Feelin' You're Foolin' '' (which earned an Oscar for Dave Gould's dance direction).

D: Roy Del Ruth. Robert Taylor, Eleanor Powell, George Murphy, Binnie Barnes, Buddy Ebsen, Judy Garland, Sophie Tucker, Charles Igor Gorin, Raymond Walburn, Robert Benchley, Willie Howard, Billy Gilbert. Not up to 1936 MELODY, with tuneful but forgettable songs, overbearing Tucker, and elephantine finale. Powell's dancing is great and Garland sings ``Dear Mr. Gable.''

D: W. S. Van Dyke. Eleanor Powell, Nelson Eddy, Frank Morgan, Edna May Oliver, Ray Bolger, Ilona Massey, Billy Gilbert. Elephantine MGM musical about romance between West Point cadet and mythical-kingdom princess. Living proof that money alone can't make a good movie. Cole Porter score includes "In the Still of the Night.''

D: Edward Buzzell. Eleanor Powell, Robert Young, George Burns, Gracie Allen, Rita Johnson, Willie Fung, Sig Rumann, Ruth Hussey, Eddie Anderson, The King's Men. Pleasant musical fluff with Young in a dual role, as a movie star who, seeking peace and quiet, trades places with his lookalike, a Hawaiian plantation owner. Powell has several dance features (including a tap hula!), but many of the best moments belong to Gracie. Oddly enough, this was Burns and Allen's final film together.

D: Norman Taurog. Fred Astaire, Eleanor Powell, George Murphy, Frank Morgan, Ian Hunter, Florence Rice, Lynne Carver, Ann Morriss. Friendship and rivalry between dance partners Astaire and Murphy spark delightful, underrated MGM musical, with hilarious vignettes, fine performance from Astaire, outstanding Cole Porter songs, and matchless Astaire-Powell numbers like ``Begin the Beguine'' (danced twice in the finale). If only they'd tie up the plot a bit sooner. Douglas McPhail (unbilled) introduces the Porter standard ``I Concentrate On You.''

D: Norman Z. McLeod. Eleanor Powell, Ann Sothern, Robert Young, Lionel Barrymore, John Carroll, Red Skelton, Virginia O'Brien, Dan Dailey, Jimmy Dorsey and His Orchestra. Spunky musical of married songwriters Sothern and Young, with Powell and Skelton along for good measure. Fine score: title tune, "Fascinating Rhythm,'' "You'll Never Know,'' Oscar-winning "Last Time I Saw Paris.''