On Friday, December 11th, Heptune's Heritage Series presents Hot Tuna (Acoustic) at 8PM in First Parish Church, Cambridge, MA  These San Francisco pioneers are celebrating 50 years of playing together.  From the heady days of the psychedelic 60's they formed their more down-to-earth rootsy sound of Hot Tuna that started out as a side trip; but ultimately became the sound that has endured through the decades.