Japanther? Is that like an Indiantelope or a Mexicostritch? I don’t know, but I do know that the Brooklyn duo’s new single, “Take Me in and Let Me Go,” is a colorful blast of melody that’s just ramshackle and raucous enough for a Saturday night. Cue it up while you’re getting ready to go out and raise some hell; repeat it while you’re cruising the streets on your way to your various hedonistic weekend pit stops; play it one last time before you fall down and pass out, on the brink of Sunday morning whether you’re ready or not. It’s that kind of song.