i dont know about famous group band of the world but the famous group band of my country is "Jal the band"
America has (or had): The Eagles, Aerosmith, Lynyrd Skynyrd, CCR, The Jimi Hendrix Experience, The Doors, and KISS The UK has (or had): The Beatles, U2, Led Zeppelin, Rolling Stones, Black Sabbath, Pink Floyd, etc...
These days most mainstream music is generated by U.S. however as far as bands are concered i think Europeans are ahead.
I think US having it that is a Oasis band that won a lots of good prizes for their best performances .
Not sure I understand the question...But the Black Eyed Peas are one of the most popular groups in America (if not the world), and they'll be performing at the Super Bowl, which is one of the bigger events...
It is easy to answer this question. They are USA and Britain. Most famous bands come from these countries.