Buzz can build and die quickly on the internet, but things move slower on terrestrial radio, or your cousin's Spotify. The songs that will be everywhere in June and July may not yet be apparent, but they have probably already been released. With that in mind, here are some early contenders for 2015's Song of Summer. It's possible there's a clear winner that's yet to emerge—Rihanna, what is your next single?!—but for now, this is the weird field.
Evidence of heat: Top 20 in 7 European countries, 15 million SoundCloud plays of a snippet
Last year's version: There actually wasn't one? In my heart, some weird calculus of Tove Lo, "Habits (Stay High)," Tinashe, "2 On," and that Flume remix of Lorde.
Thing your mom and Dutch DJs can agree on.
Evidence of heat: 5 weeks on Billboard's Hot 100, Big on Shazam in Canada, Australia, and Israel
Last year's version: Milky Chance, "Stolen Dance"; Mr. Probz, "Waves (Robin Schulz Remix)"
Evidence of heat: 145 million Spotify streams, Another 43 million vide views
Last Year's Version: Jason Derulo, "Wiggle"
Saxobeat for female empowerment.
Evidence of heat: 9 weeks on Billboard's Hot 100, 10 million video views
Last Year's Version: Ariana Grande f. Iggy Azalea, "Problem"
Neighborhood meme with big potential.
Evidence of heat: Millions of Vine loops, 4 weeks on Billboard's Hip-Hop Airplay chart
Last year's version: Bobby Shmurda, "Hot Nigga"
Piano ballad to awaken male feelings.
Evidence of heat: Most Spotify streams for a single song in a day EVER, 2 weeks atop Billboard's Hot 100, 200 million video views in 3 weeks, 1.5 million singles sold in 3 weeks
Last year's version: John Legend, "All of Me"
Best interpolation of a song from 1985-1995.
Evidence of heat: Top 40 hit in 7 countries
Last year's version: Jeremih, "Don't Tell Em"
Evidence of heat: With 18.3 million views in one week, the most viewed video released in partnership with the YouTube Music Awards
Last year's version: Enrique Iglesias, "Bailando"
Evidence of heat: 5 weeks on BIllboard's Dance chart
Last year's version: Tiësto f. Matthew Koma, "Wasted"