Music by the light of the moon -- an intoxicating combination. Certainly something that's gone on forever and a day. But on a regular basis in Miami? Apparently not. That is until 1995, when Barnacle State Historic Site park manager Terry Coulliette and friends dreamed up the idea for the Barnacle Under Moonlight concert series. The idea: Once a month, on or near the full moon (except during July and August), host a concert on the expansive back lawn of the charming Vernacular-style house built on five acres of waterfront property in 1891 by Coconut Grove pioneer Ralph Middleton Munroe. A serene setting, which calls for relaxed sounds. Various acts have been in the folk or blues vein, such as Ukrainian bandurist Yarko, local pair Outta d'Blues, and eclectic acoustic duo Tammerlin. A Celtic thing happens in honor of St. Patrick's Day, and the Top Brass Quintet plays Christmas carols in December. Florida songster Grant Livingston, the first musician ever to perform there, now traditionally closes the series each year. Listeners are invited to lounge on blankets or chairs, have a picnic, and frolic in the grass as long as they fork over five bucks (kids under age ten get in free) and leave their pets at home. Another thing they can't bring along: booze. But that's okay. The moonlight, music, and atmosphere are more than enough to make them drunk.