As Saturday arrived, we could feel tension of the end approaching. All the friends we’d made bouncing from showcase to showcase were about to go home - off to start recording, back to real jobs on Monday, back on the road. For six days, SXSW has bred one full family of music enthusiasts. It’s been a whirlwind. It’s been a treat. In the morning over on South Congress, people were jiving. The eclectic area was full of food trailers, vintage…