All your taste are belong to Jools

Guardian: The taste-makers

So you think you decide what goes into your music collection? Wrong. Alexis Petridis speaks to the people who control what you hear, like and buy

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Later with Jools Holland's impact on sales is well-documented. KT Tunstall was, by her own admission, "playing to about six people a night", until she was booked at the last minute when rapper Nas pulled out. After performing Black Horse and the Cherry Tree, her debut album was re-issued with the track included and went platinum.