I understand your thinking. They're drawn more realistically, Doofenshmirtz introduces them with the classic "ladies and gentlemen:" other real guest stars are introduced with, but apparently they're just made up. They might be somewhat based off of the BeeGees, who had a thriving rock career before they went disco.
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to be truly honest i think nobody knows if 'love Handel' is really a band
another answer on this cite, as well as the phineas and ferb wiki, say that they're fake
Love Affair - band - was created in 1966.
That band is believed to be Aerosmith.
Although many believe that the band, Blondie, was named after the singer, who was a girl, the trueorigin is more surprising. The band actually named themselves after Hitler's dog!
There is a French rockabilly band called "the gutter boys".
Yes. Named the band, and wrote the music :)