As for Sound of the Underground... dissertations have been written about this song and that group by people much more talented than me at writing those sorts of think pieces... but for me, it was the entirely unexpected roar out of the gate from a girl group I'd watched been put together on TV as a kid and, through the power of my imagination, felt like distant big sisters doing something that shouldn't have been theirs to do. I mean think of how many cheesy pop songs were released by cheesy pop groups put together by industry hacks bereft of imagination in just the six years since Spice Girls had launched (I mention, because Geri had a pivotal role in putting this band together, as you likely know)...
They may have been sort of oblivious to the genius of what they were fronting at the time, but it works regardless because they were hungry for success, had fought really hard to even be in the band at all and had all the odds stacked against them and took great pleasure in punting each obstacle out of the way with a pink and black leather finesse. The drum 'n' bass, the surf guitar, the way the chorus is just a bastardised nursery rhyme and the lyrics don't even make all that much sense anyway... the best kind of meaningless pop nonsense because it's such a riot from start to finish, it's a vibe! Queens, from 2002 until the end of time.