Question: What is the date of death of the composer of song Vanhojapoikia Viiksekkäitä?
Sentence (from "Juha Vainio"): Juha Harri "Junnu" Vainio, also known as Juha "Watt" Vainio (10 May 1938 in Kotka, Finland – 29 October 1990, Gryon, Switzerland) was a Finnish lyricist, singer, composer and teacher.
Relevant evidence: Yes