Summoning were at their best between "Minas Morgul" and "Stronghold", peaking at the "Dol Guldur"/"Nightshades Forests" combo. I cannot recall how many books I can relate to Summoning's music, despite not having thousands of layers and exotic sounds and stuff, it is one of the truly visually inspiring bands of our time, and not only do they summon Middle-Earth landscapes...
"Let Mortal Heroes Sing Your Fame" was still a very good one, but there's a disturbing air of cheesiness about it, maybe those dreadful cartoon samples, and the amazing songs/average-to-good songs ratio is much too low, maybe even <1...
My guess is they come up with a huge redemption, now!