I am in love with that extended version of Surrounded [2007] in which there are parts of Marillion. Awesome !
I love that version too.
I also like when the band seamlessly sneaks in material they've
stolen looked to for inspiration for their songs, like:
1. The Metallica riff in Peruvian Skies on OIALT
2. The Xanadu guitar work opening Trial of Tears, also on OIALT
4. The Freebird guitar solo bit included in Take the Time....ALSO from OIALT
3. The Sugar Mice bit included on Surrounded from CiM.
I'm sure there are a lot of others I haven't heard....but always think that's cool.