I really like this version of DT's Surrounded.  I am lucky to have had seen them do this twice on their tours in 07 and in 08... Amazing.  Anyway, i wanted to share...

httpv://www.youtube.com/watch?v=biTx4Jvyy9Q
Dream Theater: Surrounded (aka Surrounded 07) which includes a section of Pink Floyd's Mother and Marllion's Sugar Mice.

httpv://www.youtube.com/watch?v=r9rYXZnoMn0
Pink Floyd: Mother

httpv://www.youtube.com/watch?v=kIPrJmzG7Ss
Marllion: Sugar Mice