One of the great things about Sirius satellite radio is the breadth of music available on its service for less than $13 a month. A song played on the Sirius Blues channel last night was attention-getting because of its title: "Bad Luck City" by R.L. Burnside. (The song was, really, classic blues.)

One of the great things about Amazon.com is that, when you hear an unusual song like that, many times you can find it there and download it for free.