New Poll - Greatest Artist in Rock/Pop History

During the significant media outpouring after Michael Jackson's untimely death, on one program, the question was posed: Who is the greatest artist in rock/pop music history: Elvis, Jackson, or The Beatles?

Each has its own claim (all numbers are U.S. Billboard Hot 100 numbers):

• Elvis Presley. 18 #1 songs, 37 Top Ten songs, 96 Top 40 songs. He is, well, Elvis -- the King of Rock and Roll. Without him, one might argue, rock and roll would have been a fad.
• Michael Jackson. 13 #1 songs, 28 Top Ten songs, 37 Top 40 songs (solo); 5 #1 songs, 12 Top Ten songs, 25 Top 40 songs (with the Jackson 5). He is the self-proclaimed King of Pop. There may not have been anyone in pop music history who was as universally loved as he was. Thriller is the best-selling studio album of all-time. He is, unquestionably, the biggest artist of my lifetime.
• The Beatles. 20 #1 songs, 31 Top Ten songs, 48 Top 40 songs. They are the best-selling artist in music history, which is especially amazing considering all of their studio albums were released in a mere seven-year span (1963-1970). They never released a bad album (all but a handful of albums stayed at #1 for multiple weeks and worst-charting studio albums went to #3 in UK and #2 in US), and with compilations, they have 38 platinum albums in the U.S. alone. The Beatles are the only artist to hold every slot in Billboard's top 5 at one time.

With that, I give it to you: Who is the greatest artist in rock/pop music history: Elvis, Michael Jackson, or The Beatles?