-- Diana Ross

"With 'American Bandstand,' he introduced decades' worth of viewers to the music of our times. He reshaped the television landscape forever as a creative and innovative producer. And, of course, for 40 years, we welcomed him into our homes to ring in the New Year. But more important than his groundbreaking achievements was the way he made us feel -- as young and vibrant and optimistic as he was."

-- President Barack Obama

"Rest in Peace my good friend Dick Clark. A pioneer who's mark on American culture will be felt forever."

-- Quincy Jones, producer, via Twitter

"When my parents weren't quite sure yet about the Beatles and weren't quite sure yet about the Stones, they were sure about Dick Clark. And he kind of enabled, I think, the older generation to move on to what was happening in music."

-- Philip Mershon, a well-wisher at Clark's star on the Hollywood Walk of Fame

"Clark was a trendsetter who helped guide our tastes in music, dance and fashion for more than three decades."

-- Terry Stewart, president of the Rock and Roll Hall of Fame

"He was smart, charming, funny and always a true gentleman. I learned a great deal from him, and I'll always be indebted to him for his faith and support of me."

-- Radio and television host Ryan Seacrest, who took over Clark's New Year's Eve program on ABC

"You'll continue to be an inspiration to us all Dick Clark. Thanks for the amazing rockin years you were with us. You'll truly be missed."

-- The Jonas Brothers, via Twitter

"I loved Dick Clark. He was so instrumental in my career as well as all the other Motown acts and so many others in the recording business. Goodbye, my friend, rest in peace."

-- Smokey Robinson

"Times Square is considered the crossroads of the world in no small part because Dick Clark's New Year's Eve celebrations there were beamed across the globe. I remember one New Year's Eve, he and I stood in Times Square marveling about how much the area -- and the city -- had improved over the years. But Dick Clark never had to change -- he was a great entertainer who stood the test of time."

-- New York Mayor Michael Bloomberg

"He was a wonderful guy to work for, and he was a great pioneer. He gave you everything you needed to be the best for his television show."

-- Verdine White, Earth, Wind and Fire bassist

"Dick Clark's profound contributions to music, television and popular culture will reverberate throughout time. R.I.P. Mr. American Bandstand."

-- Music producer and Epic Records CEO Antonio "L.A." Reid

"This guy was the best. He helped me from the very bottom of my career all through the '80s and the '90s, and he's going to be missed a lot."

-- Singer Freddy Cannon, who appeared on "American Bandstand" 110 times

"Dick Clark was eternally young. No matter what culturally phenomenon was happening, he always embraced it. RIP ... "

-- Def Jam Records co-founder Russell Simmons, via Twitter