Before Robin Thicke burned up the R&B charts as a solo artist, he was a go-to songsmith for people who wanted to add some pop punch to their soul songs; he helped pen Jordan Knight’s jittery bid for post-boy-band stardom “Give It To You” and Brandy’s glittery ballad “Love Is On My Side.” Thicke perfected that soul-pop blend on his own records, both tender (the hushed “Lost Without U”) and playfully sexy (“Blurred Lines”).