This commercial came up on TV twice tonight for me. Many people see/hear the commercial, but aren't quite able to remember the specifics on the music that is being used. Since you stopped and eventually bought her a glass of wine, then she was doing fairly well with her cover of the song?
She was riffing on the main melody and doing a passable stab at the more intricate solo breaks. Good enough that it was instantly recognizable. It's been a while since we walked the square, but we go often enough that we were on friendly terms and always tipped her with $ and wine.
The human jukebox. Thank you for putting me on on some of these amazing artists. Especially 70s and 80s @Manny Ramirez