Frankenmuth's Greta Van Fleet has offered up the first taste of its upcoming new album.Early Tuesday morning, July 17, the hard rocking quartet released "When The Curtain Falls," a rhythmic, dynamic and psychedelic-tinged track built on a muscular groove. Frontman Josh Kiska's waiting vocals still hew impressively close to Led Zeppelin's Robert Plant but take on a slightly more metallic edge during parts of the song.