According to reports, Pink Floyd's Roger Waters will have a surprise guest at one of his upcoming shows on 'The Wall" tour: feloow Pink Floyd guitarist / vocalist David Gilmour. It will be just the second time the two have performed onstage together since their bitter parting of ways back in the early 80s. The pair are remaining hush about which tour stop Gilmour will show up on. Click Here for a complete list of Roger Waters' "The Wall" tour dates.