Any song released during the digital era can only be considered a classic if it passed 7 million sales, as it takes tremendous longevity and cross demographic appeal for a song (qualities that makes a song a classic) to sell 7M
"I Gotta Feeling"
"Rolling in the Deep"
"Party Rock Anthem"
"Somebody That I Used to Know"
"Call Me Maybe"
"Thrift Shop"
"Poker Face"
"Blurred Lines"
"Radioactive"
"Low"
"Cruise"
"Just Dance" is coming too
