Bruno Mars is a pastiche artist. That’s just who he is. He is very good at it, too — a born entertainer, a gifted songwriter, a master of period detail rivaling any Hollywood professional. Over the past decade, Mars has carved out a space as mainstream pop’s official retro ambassador. You are not ever going to find him pushing music forward, but he can be counted on to show up every couple years with expert facsimiles of bygone genres, overtly fun and catchy music bound to get wedding dance floors grooving and tickle the fancy of people who lament that music isn’t what it used to be. Bruno Mars owns this lane. And with Silk Sonic, he has decided to share it.