Meghan Trainor and Fifth Harmony — the headliners of this year’s BLI Summer Jam on Saturday at Nikon at Jones Beach Theater — couldn’t be hotter, each with new albums that debuted in the Top 5 and new tours on the horizon.

So is any ticket holder going to miss them? As Trainor would happily declare, “No.”

But this year’s festival is also brimming with newcomers who could quickly graduate to headliner status, the way Fifth Harmony, openers in 2014, have. Here’s a look at three reasons to come early:

MELANIE MARTINEZ

BIO The Baldwin native is getting ready for a big summer. In addition to a sold-out European tour, the “Cry Baby” singer also will be part of the debut of the Panorama Festival in July, bringing her mix of personal stories and trap beats to an even larger crowd. Martinez is coming into her own as a musician as well as an artist. “When I started, I was very unsure of who I was,” she told Newsday last year. “There were a lot of things in the songs that I didn’t realize I was saying. But more and more, it fell into place. . . . I got more comfortable in my skin.”

NEW SINGLE “Alphabet Boy”

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TROYE SIVAN

BIO The Australian singer-songwriter got his start as a child actor (in “X-Men Origins: Wolverine”) and was discovered on YouTube, so he knows the power of a great video. He has released a string of connected videos from his debut, “Blue Neighbourhood,” to show off his storytelling abilities, as well as why so many are calling the male counterpart to Lorde.

NEW SINGLE “Youth”

THE CHAINSMOKERS

BIO Nikon at Jones Beach Theater has been very good to Andrew Taggart and Alex Pall, the production duo better known as The Chainsmokers. It was last year’s Jones Beach appearance that helped them transform their image from the novelty act behind “#Selfie” into a budding pop powerhouse that can now boast a string of pop hits.

NEW SINGLE “Don’t Let Me Down”