Thought I heard somewhere about fan-made remixes of songs that should have been in Brawl... and I don't know if these are that fan-made collection or not. In other words, I don't know whether these are official (were going to be in the game or cut), fan-made (never going to be in the game), or just fan-made remixes of what was going to appear in Brawl (song is correct but different from what was going to be added).
That said, Beware The Forest's Mushrooms TOTALLY should have made it in, considering some of the more completely-battle-inappropriate-music that made it in like the Donkey Kong Country map. If that made it in, this should have made it in. And since Sonic and Snake and Olimar made it into Brawl... even frickin ROB... Geno's not out of the question.
Yoshi's Cookie Type A is a longtime favorite of mine (someone remembers the game!), but again, sounds like it has no place in Brawl.
But it's a plausible list simply because there's cut EarthBound/Mother music on that list, knowing how much of an EarthBound nut that Sakurai and HAL are. "Because I Love You" is I believe the ending theme to EarthBound, which is just a slower version of Fourside (Melee already had a Fourside track). Hippie theme was a favorite of mine in EarthBound, so specifically it's 0:35-1:08 of the Hippie theme I like, though in hindsight it really isn't one of the more memorable EarthBound tracks. I'd say the Stray Dog enemy music in EarthBound is more recognizable. *watches EB videos* Gosh darn it, Diamond Dog reflecting the Multi-Bottle Rocket has to be one of the more brutal attacks in a game.