A song is a song. Are we going to split Descend into like 10 songs too?
You can't just start banning the best entries in a contest because they might win.
It's not even remotely the same. Descend takes beats and themes from the major songs and ties them together. Cascade takes 4 songs and places them one after the other, except a little bit of alteration for a few seconds at the end of Dreaming Dead and Flare. Plenty of people won't think of Descend as a bunch of songs, EVERYONE realizes that Cascade is just 4 songs. And, again, barely anybody who doesn't read HS will be willing to listen to a 13 minute songs. If Cascade gets in, then the other 4 songs should not, or vice versa.
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