Harry Wayne Casey, the “KC” in funk/disco group KC and the Sunshine Band, will perform the classics during Saturday’s show at Easton’s State Theatre, though he’s hardly resting on his laurels.

The “Get Down Tonight” singer-songwriter, who founded the Sunshine Band in 1973 in Hialeah, Florida, soon will unveil the new dance tracks “Love Goes Up and Down” and “I Feel You.”

In all, KC, who released his 14th and 15th studio albums “Feeling You! The 60s” and “A Sunshine Christmas” in 2015, recently “finished up 56 songs that I’ve been working on the last 10 years.”

Over the last decade, KC and the Sunshine Band has issued a number of dance tracks, including a 2024 collaboration with music director/singer/producer NYNE on “In the Back of My Cadillac.” The Sunshine Band also includes percussionist Fermin Goytisolo, the group’s only other original member.

Aside from working on new material, KC plans to bring the musical “Get Down Tonight” to the U.S., on Broadway and beyond. The coming-of-age show, which enjoyed a London run in fall 2025 and features 20-plus KC songs, spotlights the musician’s early years in 1970s Miami.

“We’re going to rewrite it from where it was in London,” said KC, who hoped the show would make its U.S. debut in the fall. A 2027 premiere looks more likely.

KC, who grew up in his current residence of Hialeah, knew he wanted to pursue music since he was a Motown- and Stax Records-loving child.

“If it was funky, I loved it,” the keyboardist/producer said, adding that his favorite artists included Aretha Franklin, Wilson Pickett, Otis Redding, James Brown, and Sly and the Family Stone.

As a teen, KC worked at a local record store and performed menial tasks around the TK Records/Studio complex in his hometown. Henry Stone, TK co-owner/president, noticed KC’s musical interest.

“Once Henry got to know me, he knew what I wanted to do,” KC said. “I started writing with people. There was a piano in the office; he had seen me play on it. I think he was aware of my ambitions.”

KC and the Sunshine Band’s debut studio album “Do It Good” arrived in April 1974. The set housed the Billboard R&B hits “Blow Your Whistle,” “Sound Your Funky Horn” and “Queen of Clubs.”

Also in 1974, soul/disco singer George McCrae’s “Rock Your Baby,” which KC co-wrote, hit No. 1 on Billboard’s Hot 100. In 1975, KC and the Sunshine Band scored Hot 100 No. 1s with “Get Down Tonight,” KC’s all-time favorite, and “That’s the Way (I Like It).”

Three more Hot 100 No. 1s came KC’s way: “(Shake, Shake, Shake) Shake Your Booty,” “I’m Your Boogie Man” and “Please Don’t Go.” Other hits include the “Saturday Night Fever”-boosted “Boogie Shoes,” plus “Keep It Comin’ Love” and a duet with friend Teri DeSario on “Yes, I’m Ready.”

Shortly after “Give It Up” hit the Hot 100’s top 20 in 1984, KC retired from music and developed a drug addiction. A return to performing in the early 1990s prompted a change in 1995, with KC calling his decision to spend a few months in outpatient rehab the best he ever made.

“It was like being born again, finding me again,” said KC, who was never high when on stage.

Today, when performing, KC, who survived a 1981 car crash that left him in traction for nine months and with nerve damage to his right leg, does “an awful lot for 75. Everything is more calculated. I can’t run or do high-impact stuff; it starts affecting the nerve again. I can jog a little bit.”

To this day, KC’s initial motivation to make music — evoking happiness and helping people forget their problems — continues to resonate, with his music inspiring all audiences to dance.

That includes the gay community, to which KC tipped a hat with the 2016 dance hit “We Belong Together.” The single art depicts three pictogram pairs: two men, two women, and a man and woman. Furthermore, the lyric video includes images of same-sex couples.

“I don’t know if people caught the idea of what it was about, how we all belong together,” KC said. “All this separation is for the birds.”

KC’s music-for-all discography has led to countless uses of his music in various media. Some notable syncs include “Get Down Tonight” in the 1994 film “Forrest Gump” and a 1995 ants-starring Budweiser commercial, and “Give It Up” in the 2015 film “Kingsman: The Secret Service.”

Even though KC’s music has served as a call to dance for some 50 years, the recent Songwriters Hall of Fame nominee has yet to receive a nod for the Rock & Roll Hall of Fame.

“I don’t even know if I care,” KC said. “There are a lot of people who belong that aren’t in, and there are a lot in there that don’t belong. I don’t know what stigma there is. My music has been influential and had an impact worldwide. Why it gets overlooked, I have no idea.”