Probably a feature of every big-city transit system: the itinerant musician who shows up to play at the stops along the way. The North Berkeley BART station a couple blocks from where we has a cast of folks who show up semi-regularly. There are three guitar players I can think of whom I've seen out there: a middle-aged guy who plays a nice classical guitar and always seems to land a decent pile of bills from the from passersby; a young guy who has sung himself hoarse thrashing out folk-rock tunes and looks ragged, like he's barely hanging on; and the woman above.
Her name is Lily, and she plays slide steel guitar. I'm not a music critic, but I heard some nice touches in amid some scrambling to find the next logical note or chord. (Disclosure: I'm not sure I could find a single chord, logical or otherwise, on any kind of instrument.) I had my sound kit with me and recorded a little bit and talked to her briefly. The audio is below: