Yale said the 65-year-old McCartney awakened a generation, giving a fresh sound to rock, roll, rhythm, and blues.

"Here, there and everywhere, you have pushed the boundaries of the familiar to create new classics," said Yale President Richard Levin. "We admire your musical genius and your generous support of worthy causes."

McCartney wore a traditional black academic robe at the graduation ceremony and was welcomed with warm applause and cheers from students gathered.

A band played classic Beatle song "Hey Jude" as McCartney walked on stage to accept the honorary degree.

The day before the former Beatle's appearance at the university, former British Prime Minister Tony Blair spoke at the university's Class Day and mentioned the rock icon in his speech.

The singer-songwriter became Sir Paul McCartney when he was knighted in 1996 by the Queen of England.

McCartney is listed in Guinness World Records as the most successful musician and composer in popular music history, with 60 gold discs and sales of 100 million singles.

His song "Yesterday" is listed as the most covered song in history and has been played more than 7,000,000 times on US television and radio.

McCartney is also an advocate for music education, vegetarianism and animal rights.