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Last year, the music identification app Shazam predicted that Gotye's Somebody That I Used to Know would be the most popular song of the summer. Good guess.

This year, Shazam has determined that Daft Punk's Get Lucky is heir to the Sounds of Summer throne. The funky tune has pulled in 4 million searches - the app "tags" a song every time you hold up a tablet or smartphone to figure out what you're listening to - and has been No. 1 on Shazam charts in 91 countries. "Our primary metric is tag volume, editorial judgment, spikes in popularity and watching those trends," says Will Mills, Shazam's director of music and content.

This year's Gotye could be Passenger's Let Her Go, which has been picking up steam with 3.8 million tags and is No. 1 on 13 international Shazam tag charts. It hasn't broken through in the USA yet, but Shazam predicts similar success. Like Gotye, "it's got a kind of acoustic (sound) and it's a new voice," Mills says. "It's not just the Rihannas and Coldplays that get tagged. Shazam is becoming the go-to source for music discovery."

Last year, 75% of Shazam's No. 1 tracks in the USA reached top 10 status on Billboard's Hot 100 in an average of 43 days. That song about crashing cars into bridges and loving it that was on HBO's Girls? That's Icona Pop's I Love It, now No. 7 on the Hot 100.

Here's the full list.

1. Get Lucky, Daft Punk
2. Let Her Go, Passenger
3. I Love It, Icona Pop
4. Blurred Lines, Robin Thicke
5. Fall Down, will.i.am with Miley Cyrus
6. Alive, Krewella
7. Young and Beautiful (off The Great Gatsby soundtrack), Lana Del Rey
8. Q.U.E.E.N., Janelle Monae, featuring Erykah Badu
9. Tapout, Rich Gang
10. Interlude, Chance the Rapper