It grew cooler as the evening wore on at Fort Dupont last night, but the heat of the music remained a constant. Tenor saxophonist Stanley Turrentine opened the second part of the free concert with gospel directness and went on to bare his soul in blues that cried and ballads that were warm and tender.

Much of Turrentine's ability to communicate springs from the voice-like timbre of his horn and the conversational cadence of his phrasing. Several ballads came out wistful and yearning; on other tunes he stripped the blues down to the essentials. "I Know It's You" was vintage Turrentine preaching with all-stops-out church organ by John Miller. A following piece that used a funky line over an insistent boogie beat built to a frenzied climax. Greg Skaff was on guitar, Jon Hart on electric bass and Doug Nally at the drums.

Mary Blankemeier began the program in a lusty, blues-drenched voice and handled two or three older standards with driving swing, but her greatest strength erupted in a raunchy delivery of "Wild Women Don't Have the Blues" and "Ain't Nobody's Business if I Do." Her quartet--reed player Al Williams, keyboardist David Ylvisaker, electric bassist Stan Sargeant and drumer Warren Shadd--lent grand support.

The program is repeated tonight.