Rising pop singer Cyn has announced her debut EP Mood Swing, out Sep. 20 via Katy Perry's Unsub Records, Billboard can exclusively reveal today (Aug. 21).

In addition, despite August nearing its end, Cyn refuses to let the sunshine fade in her newest single, "Never-Ending Summer." The glittering tune gives Cyn's lush vocals a chance to shine.

Co-written by Jesse Saint John, Cyn dances over Lars Stalfors' clean production to reach the chorus' infectious melody: "Now I don't know how I got so high/ Feels like I'll never see December/ It's so hot it's like/ Living in a never-ending summer."

Cyn found inspiration looking back on her childhood summers in Michigan -- specifically, memories from the 4th of July.

"Growing up on the lake in Michigan, the 4th of July was like the summer Christmas that all my neighbors were celebrating," Cyn tells Billboard. "Boats strung together, floating over the sandbar, kids receiving little supervision from parents (and loving it), diving into the water and climbing back onto the boat enough times to have an ear infection the next day -- I mean, the 4th of July is just one of my favorite feelings."

Cyn previously released "Holy Roller," which will also appear on Mood Swing.

"Never-Ending Summer" adds a sweeter, softer touch to Cyn's repertoire, promising Mood Swing will be a well-rounded project.

"I feel ecstatic to be releasing songs that overall have a positive tone to them," Cyn says. "I think my EP has an appreciation for life feeling to it, a sense of humor, and some serious honesty."

Listen to "Never-Ending Summer" below.