Conversation so far:
When was Oingo Boingo born?
Oingo Boingo was an American new wave band, formed by songwriter Danny Elfman in 1979.
How did Oingo Boingo form?
Oingo Boingo emerged from a surrealist performance art theatrical troupe, The Mystic Knights of the Oingo Boingo, founded in 1972 and led by Danny Elfman's brother Richard Elfman.
Did Oingo Boingo make any albums?
Following the regional success of the Oingo Boingo EP, the group released its first full-length album in 1981, also titled Only a Lad, on A&M Records.
What was Oingo Boingo's greatest accomplishment?
Oingo Boingo's body of work spanned 17 years, with various genre and line-up changes. Their best-known songs include Only a Lad, Dead Man's Party and Weird Science.
How did the  Oingo Boingo film, Back to School do?
The film, Back to School received mainly positive reviews from critics, and is the 6th highest-grossing film of 1986.
Did the film, Back to School win any awards?
What is the most important fact in the Oingo Boingo's article?
As Richard Elfman's interest shifted to filmmaking, he passed leadership of the band to younger brother Danny,

Question: when did he pass his leadership of the band?
Self-contained rewrite: When did Richard Elfman pass his leadership of the band?