Weekly magazine Interviu is issued since 1976 until today.
1979 March 8-14
No 147 Vol 4

Frank Zappa, la "Madre del invento":
Mi música no es pornográfica
By Carlos Bosch, 2 pp
(Full text at El 3er Poder)

J.Marcote: This [exclusive] interview is performed in Paris someday before the Spanish shows in Barcelona & Madrid. [1979 March 13-14]

I like the last reply to this question:
Q: "What is the least stupid thing?"
FZ: "Silence".

Source: Javier Marcote