This is the first time I've heard of Yacht-Rock, but perhaps we're guilty.  We have a different definition, though:  My "mate" and I frequently anchor our Katrina-salvaged yacht in a small cut off the Tchefuncte River, near Madisonville, which is on the northshore of New Orleans.  We listen (loudly) to RP, to XM Chill and what used to be XM Cafe and is now "Spectrum."  It's an eclectic mix of Indy, Reggae, dance hip-hop, up-beat New Age and current non-pop rock.  We have a decent sound system on the boat and others moored nearby - including the "Twenty-Somethings" - have told us they really enjoy what we 're listening to.  We've never heard the Doobie Brothers on these outings, although the Doobies have done some nice stuff about our area.  Nevertheless, we "yacht-rockers" have moved on.