FALL ALBUMS : In Brief : ** Donna Summer, “Mistaken Identity,” Atlantic.

At fortysomething, Summer sounds as if she’s still in search of her own musical identity. There are dance tracks here that are virtually indistinguishable from records Summer was making more than a decade ago when she was the queen of disco. And while a few of those dance numbers get by, the only song that actually seems to mean something to the singer is “Friends Unknown,” an intense, heartfelt ballad.

Four asterisks: excellent; three stars, good; two stars, fair; one star: poor.