I've never played New Generation, 2nd Impact, or Alpha 2, but they would have to be beyond godlike to be better than 3rd Strike.
Since you're naming SF3 titles, I sorta wouldn't be surprised either.
You can't say name a good tune from 3rd strike and then handicap it by saying you can't pick one of its best beats.
And cmon, everyone knows the Alex/ken stage. That stage music is off the chain. Makoto, Yun, Ibuki, Dudley, and Akuma are all extremely memorable and by far one of the best I've heard in a fighting game. Then you got Oro/Sean, Elena and Necro. The only weak stage music out of the bunch is Gill, Urien, Hugo, Remy, and maybe Chun.