Every Tuesday through Friday from 12:20 to 12:50 there's a free Bach performance at Grace Cathedral Church on 14th street. They have a really spectacular organ and a rotating program of world class organists. The series began on 9/11/2001 as a meditation for the grieving downtowners, but has since become a staple in the lives of many throughout the city. When I was a shop girl in the East Village I used to go on my lunch break to, as they write on their website, "briefly transcend the ugliness of the world."
I've wept at Bach at Noon, been felt up at Bach at Noon, fallen in love at Bach at Noon, slept at Bach at Noon-- it's one of the most wonderful mainstays in my life.