A few fast facte; MGM Records, in '53, started Joni James to stardom, and. layt year found Betty Mfldlfian. They're betting on Rosalind Paige for '55* . With baseball just around the hot stove, King Records' Earl Bostic is getting ready early— he’ll record a mambo version of last season’s almost-hit, Say, Hey the Willie Mays song . . . Elise Rhodes, of Mood Records, doesn't have to worry about hit records—just inherited a lot of Connecticut real estate . . , Dennis Day’s given JtCA an ultimatum—give him some non-Irish songs to record or else. Doesn't want to be an Erin boy all hia life.