This video cleared up a mystery that arose for me earlier today.  Following a comment on YouTube, I went to a site called theworstgig.com, where artists recounted some of thier worst experiences in the business.  Grace's contribution was to talk about not her worst gig, but her worst tour, in which she and the band suffered numerous humiliations at the hands of the headliner (or at least those running the tour for the headliner).  She was very PC, and did not mention who the headline act was, but from this interview it is apparent that she was talking about the Dave Matthews Band.  In this interview she chalks the experience up to her own inexperience, but on the worst gig site it sounds like the band was not treated as well as one might have hoped.