The string quarter was playing in the BART station early morning as people bustled toward wor. The musicians were taking the occasion to seriously rehearse.

They didn't stop a piece and start again to correct, but they did talk to each other technically as they played and between pieces.

The music they made was focussed with more "this is it" than most station music.

Work again, but today, this is it. Music hundreds of years old again, but this time alive in a new way.