Good music for a long commute

I've been working on my iPod music lately, looking for songs for my long drive to work.  I have long been a fan of Audra MacDonald - such a perfect voice.  My daughter and I got to see her a few years ago at Davies Symphony hall.  She was simply spectacular.

Her pairing with Brian Stokes Mitchell, singing "Sarah Brown Eyes" from Ragtime (which is returning to Broadway this fall), is one of her best.  If you have never heard it, you have missed a treat.  It would be a good song to add to your collection.