Lord of Light, The Re-incarnation of Benjamin Breeg, Different Worlds - Iron Maiden (I think it's the difference in guitars, and pickup positions, but the general Marshallness of it all)
Comfortably Numb - Pink Floyd
Moonshield, The Jester's Dance - In Flames (the clean bits)
Wait, do you mean similar sounds in all 3 songs?
Everything's Eventual (tm)
Scarborough Fair/Canticle (Cover)