POP & ROCK

Everyone knows that Barbra Streisand and Don Johnson have been spending a lot of time together, but apparently at least some of that time was spent in the recording studio. Just released is “Till I Loved You,” a tune the high-profile pair have recorded as a duet. The single will show up on both Johnson’s second LP and Streisand’s new one--her first studio project since “The Broadway Album” in 1985--which is due in stores Oct. 25.