This has been bugging me since you posted it .. knew Grace had mentioned Cole Porter but couldn't remember where.  
Finally did . . it was during the Q&amp;A part of the session she did with Mix100.7 in Tampa on March 4th.  
I was lucky enough to be online to catch a link to the live stream and I tweeted the songs and a couple other bits that stood out for me - one being this: 

<i>"asked most recent iPod listens @gracepotter said Cole Porter, Dawes, and Black Keys</i> 

not sure how long before this falls off the edge into Twitter old tweets black hole but 
http://twitter.com/#!/toofarnorth2/status/43732124532097024