You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "What year did the country music duo composed of sisters Janis Oliver and Kristine Arnold second album come out?" whose answer is 1988.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Janis Oliver and Kristine Arnold discography
Useful Output:

Doc 1: From the Terry Ison collection John Campbell Jim Conroy Jenny Sutton Janis Oliver Kristine Arnold Diedre.  album and CD was later released.
Doc 2: Item description from the seller ; 1986, Sweethearts of the Rodeo, 8 ; 1988, One Time, One Night, 11 ; 1990, Buffalo Zone, 41 ; 1992, Sisters, —.
Doc 3: Sweethearts Of The Rodeo is a female country music duo from Los Angeles comprised of sisters Janis Oliver and Kristine Arnold, discovered by
Doc 4: The sister duo of Kristine and Janis Oliver hit Nashville with a big splash and had several Top Ten hits in the 1980s, and then, like many artists of the era,
Doc 5: Sister of Kristine Arnold. Married to Vince Gill [1980-97]. Also Known As. Janis Oliver-Gill, Janis Gill. Share. Share this. Follow 0 followers. Discography. 1.