Passage: In 1965, Queen Elizabeth II appointed Lennon, McCartney, Harrison and Starr Members of the Order of the British Empire (MBE). The film Let It Be (1970) won the 1971 Academy Award for Best Original Song Score. The recipients of seven Grammy Awards and fifteen Ivor Novello Awards, the Beatles have 6 Diamond albums, as well as 20 Multi-Platinum albums, 16 Platinum albums and 6 Gold albums in the United States. In the UK, the Beatles have four Multi-Platinum albums, four Platinum albums, eight Gold albums and one Silver album. They were inducted into the Rock and Roll Hall of Fame in 1988.

Question: when was the recipients of seven Grammy awards inducted to the rock and Roll?
1988