Spanish helmer Fernando Trueba has been bitten by the toon bug.

Spurred by the critical success of his Oscar-nommed “Chico y Rita,” Trueba is writing the screenplay for his second animated pic.

Like Cuba-set “Chico y Rita,” the provisionally titled “Tenorio” is based on the real-life story of a musician, Brazilian pianist Francisco Tenorio Jr., who vanished under mysterious circumstances while on tour in Argentina, four days before a military coup in 1976.

It’s widely believed he was arrested in a case of mistaken identity and murdered.

Trueba has wanted to make a documentary about the pianist for years and has amassed some 150 hours of interviews and research footage.

“While making ‘Chico y Rita,’ I realized that animation would be the perfect format for ‘Tenorio,’ and was even more convinced after seeing ‘Waltz With Bashir’ and ‘Persepolis,’ ” he said. ” ‘Tenorio” is a film about music and about memory but also about the barbarity of Fascism.

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“It’s an homage to the golden age of Brazilian music, which was sharply cut by political and economic circumstances.”