SPECIAL PREMIERE: Producer Ken Ehrlich has been overseeing fabulous performance pairings at the Grammys for decades, and is one of the most tasteful and, at times daring, music producers on television. (He also, he told me once, got every performer to sign a personal scrapbook for him, often with scraps of their own lyrics, which must be an amazing book by now.) At Ehrlich’s first Grammys show, he paired Barbra Streisand and Neil Diamond for a live performance of “You Don’t Bri