With festival-ready indie pop-rock, Moon Taxi leans on feel-good hooks that build to big choruses filled with pounding bass lines and strange synths. Performing two nights at Headliners, Moon Taxi — who recently released their fourth studio album, “Daybreaker” — perform the type of danceable, TV-commercial sugar that is commonly scattered throughout the summer music scene. So, if that’s what you’re missing at the halfway mark to Bonnaroo and Forecastle, this is your show.