The Gallaghers came into the rock music scene with a history of 'fast living' I guess you might call it, and that is evident in the sentiments of most of their early music. "Supersonic" is a pretty upbeat piece, Oasis was always good at keeping positive whatever negative influences were going on in their lives, just living high and enjoying it without looking out for consequences. Fortunately the Gallaghers got down from this high before any tragedy, so their songs retain the same optimism they had at the time. Noel reportedly wrote the lyrics really quickly, and the main criteria seems to be that they rhymed lol; but the guitar sections on "Supersonic" are impressive, I've seen some killer live versions online.
Oh, and this is the one that was infamous for giving poor Elsa a bad rap ("I know a girl named Elsa / she's into Alka Seltzer" etc.). Elsa was actually a dog, she belonged to a sound engineer and was visiting the studio when they recorded.
"Supersonic" is a favorite of both the bandmembers and the fans, with good reason, you can't miss it. The B-sides are pretty good as well, "Take Me Away" is a beautiful slower song that Noel sings (love the "Octopus's Garden" references in the lyrics). "I Will Believe" is worth a listen, and you may already know "Columbia"; the one here is not too different, an early demo version. Also worth listening to, and downloading if you're all about having a complete Oasis collection. Five stars. Rock on.