The 55th season of the acclaimed family program features a star-studded lineup of musicians that would be the envy of any summer festival: SZA, Chris Stapleton, Noah Kahan, Reneé Rapp and Samara Joy.

(Photo by Slaven Vlasic/Getty Images for HBO) "SZA is really cool — really talented. And ‘gratitude’ was a new word for Elmo, too. So, Elmo learned all about gratitude with SZA," he said.

“SZA is really cool — really talented. And ‘gratitude’ was a new word for Elmo, too. So, Elmo learned all about gratitude with SZA,” he said. “Elmo was feeling really, really happy ...

So, Elmo learned all about gratitude with SZA,” he said. "Elmo was feeling really, really happy after his playdate with Miss Reneé. It was a really beautiful song.

So, Elmo learned all about gratitude with SZA,” he said. “Elmo was feeling really, really happy after his playdate with Miss Reneé. It was a really beautiful song.

"SZA is really cool — really talented. And ‘gratitude’ was a new word for Elmo, too. So, Elmo learned all about gratitude with SZA,” he said. "Elmo was feeling really, really happy after ...

“SZA is really cool — really talented. And ‘gratitude’ was a new word for Elmo, too. So, Elmo learned all about gratitude with SZA,” he said. Advertising “Elmo was feeling ...

No one is more excited than Elmo himself. “There's a lot to learn ... with us on ‘Sesame Street,' like Miss Reneé Rapp and SZA! Chris Stapleton, Noah Kahan, Samara Joy — lots of great ...

“SZA is really cool — really talented. And ‘gratitude’ was a new word for Elmo, too. So, Elmo learned all about gratitude with SZA,” he said. “Elmo was feeling really, really happy ...

This image released by Sesame Workshop shows singer SZA, left, with muppet character Oscar the Grouch on the set of "Sesame Street." (Richard Termine/Sesame Workshop via AP) ...