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In page The Monkees:

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Kirshner next allowed Nesmith to produce sessions, provided he did not play on any tracks he produced.[6] Nesmith did, however, start using the other Monkees in his sessions; he especially used Tork as a guitarist.[citation needed][a] Kirshner came back to the enthusiastic Boyce and Hart to be the regular producers, but he brought in one of his top East Coast associates, Jack Keller, to lend some production experience to the sessions.[6] Boyce and Hart quickly realized that, when together, the four actors fooled around and tried to crack each other up. Because of this, the producers often brought in each singer individually.[9]