The HBO doc 'Yacht Rock' takes a fond, ironic look at how 1970s bands like Steely Dan, Toto and Christopher Cross found a new generation of fans.

As music critic and writer Steve Huey once explained, "from 1976 to 1984, the radio airwaves were dominated by really smooth music." Once known as soft rock, since the mid-2000s pretty much everyone has called it Yacht Rock.

Now it's time to heat up leftovers, relax on the couch and enjoy the smooth sounds of a wrongly mocked music genre: yacht rock. The late-'70s songs of Steely Dan, Michael McDonald and Christopher Cross take center stage Friday in the well-crafted Max documentary “Music Box: Yacht Rock: A DOCKumentary.