Indie-jazz is a pretty accessible inlet within the bay that yacht rock usually drops anchor. And though the latter is trickier to define than the former, their currents and tides undeniably influence one another. You’ll hear that same fluidity in Mark Ghastine‘s budding discography, which so far consists of six standalone singles. They’re chock-full of effects-drenched, harmony-heavy vocals, satisfyingly mellow chord structures, and a soft ’70s-style sensibility, though you’ll occasionally get something more in line with the ’90s slacker funk of RHCP (see “Tell Me How I Feel”). This summer Mark Ghastine expands on that buoyant sound with his debut EP, and you can begin to tally up the talent of this singer-guitarist by working your way back through his singles catalogue beginning with “Did You Do the Math?”.