Legendary producer George Martin, who was known around the world as the "Fifth Beatle" for his extensive work with the group, has passed away at the age of 90. The news first hit online late last night and was then confirmed by both Ringo Starr and Paul McCartney on Twitter. In a statement on his website, McCartney wrote that Martin was like a second father to him over the years. "If anyone earned the title of the fifth Beatle it was George. From the day that he gave The Beatles our first recording contract, to the last time I saw him, he was the most generous, intelligent and musical person I’ve ever had the pleasure to know," McCartney wrote. 

Martin was a staple in the music industry for decades and widely credited for giving the Beatles their first record contract and then for work on their albums over the years, with the only exception being the project Let It Be. Following the news of his death, a number of stars from across the music industry have shared their thoughts and condolences with Martin and his family, as well as the two living Beatles, Starr and McCartney. Aside from the Beatles, Martin also worked with Elton JohnJeff BeckCheap Trick, and more throughout his career, and won a total of six Grammys with the group over the years. 

According to Billboard, Martin holds the record for most No. 1 songs on the Hot 100 chart through his career with 23, which is ahead of the likes of Max Martin, Mariah Carey, and more. He produced such hit songs for the group as "I Want to Hold Your Hand," "Love Me Do," "Help!," "Yesterday," "Penny Lane," "Hey Jude," and many more. Martin was inducted into the Rock & Roll Hall of Fame in 1990, which was also the same year that McCartney was inducted. You can check out the full reaction from the music industry to Martin's death below.