Is it me, or did the dub just make a bunch of variations of the opening theme and try passing them off as new tunes? o_o; Cause that's what the dub's song for Goku turning Super Saiyan 3 sounds like to me.
Also seems a little too…positive for what was supposed to be perceived as a suspenseful scene (making you question if Goku is actually serious about there being another form), as well as serious (between Goku's energy causing the Earth to shake, everyone running in panic as windows from buildings shatter, as well as the fact that he's effectively cutting his time on Earth) to eventual positive surprise.
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This was the song that was used. I dunno, I may be just being picky. But I noticed they did the same thing in Season 3 when Gohan erupts on Freeza after chucking Kuririn into the water and not letting Gohan go after him. They played the dub opening for his onslaught on Freeza, as if something horrifying didn't just happen and Kuririn being possibly dead. Compare it to this:
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The song used in the Japanese version kicks in at the 10 second mark.
Edit: Found someone who actually uploaded the scene with the Japanese BGM. God, it's a pain in the ass finding DBZ videos with anything Japanese on it these days.
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It gives a better example of what I meant.