The Beatles had such a far-reaching influence on popular music subsequent, that they have to be up there. The diversity they showed throughout their career, from Please Please Me to Let it Be, is testament to just how creative these four guys were.
It’s too difficult a question, though – everybody has an opinion, but is there such thing as a singular ‘right’ answer? I’d like to think so, but in reality, there really isn’t. There are just certain bands most of us can agree had a huge impact on music generally – Pink Floyd, The Beatles, David Bowie, Billy Joel, The Rolling Stones, The Beach Boys, et cetera.
As for my own preference, I’m going to state the case for Pink Floyd, simply because they brought out Dark Side of the Moon – an aural masterpiece.