These are the top 10 songs of all time according to Billboard, as of August 2, 2013:

1. The Twist - Chubby Checker
2. Smooth - Santana f. Rob Thomas
3. Mack the Knife - Bobby Darin
4. How Do I Live - LeAnn Rimes
5. Party Rock Anthem - LMFAO
6. I Gotta Feeling - Black Eyed Peas
7. Macarena - Los Del Rio
8. Physical - Olivia Newton-John
9. You Light Up My Life - Debby Boone
10. Hey Jude - The Beatles

Not a very satisfying list.

Mariah Carey and Jewel made the top 20 but not the top 10:

http://www.billboard.com/articles/list/2155531/the-hot-100-all-time-top-songs?mobile_redirection=false&list_page=8

Top selling digital singles of all time:

http://en.m.wikipedia.org/wiki/List_of_best-selling_singles#Best-selling_digital_singles

Kesha "Tik Tok" is number 1 with 15 million units sold. 

A more respectable list derived from lists of songs considered the best:

"Smells Like Teen Spirit" – Nirvana (6 times)
"Hotel California" – Eagles (4 times)
"Billie Jean" – Michael Jackson (4 times)
"One" – U2 (3 times)
"Imagine" – John Lennon (3 times)
"(I Can't Get No) Satisfaction" – The Rolling Stones (3 times)
"Sweet Child O' Mine" – Guns N' Roses (3 times)
"Stairway to Heaven" – Led Zeppelin (3 times)
"Like a Virgin" – Madonna (3 times)

Source: http://en.wikipedia.org/wiki/List_of_songs_considered_the_best

HOT 100 55th ANNIVERSARY CENTRAL

• Hot 100 By The Numbers

• Hot 100 at 55: New & Familiar Faces Highlight All-Time Ranking

• Chubby Checker Video Q&A and 'Twist' Dance Lesson

• Hot 100 List: Every No. 1 Song (1958-2013)

Now I gotta listen to Smooth again.

#2 of all time? Really??