It's the final part of the week, which means its hall of fame time and this week John inducts uber pop producer and songwriter Max Martin. Yet another person you might not have heard of, but will definitely know his music. Don't believe us? He has the 3rd most number ones of all time as a songwriter. Still don't believe us? He's the 2nd most number ones as a producer. Be prepared to face up to your musical guilty pleasures!

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