A two-time inductee into the Rock and Roll Hall of Fame, as a member of The Beatles in 1988, and as a solo artist in 1999, and a 21-time Grammy Award winner (having won both individually and with the Beatles), McCartney has written, or co-written 32 songs that have reached number one on the Billboard Hot 100, and as of 2014 he has sold more than 15.5 million RIAA-certified units in the United States.