Here's a short story:

(CNN) -- A lawsuit has been filed claiming that the iconic Led Zeppelin song "Stairway to Heaven" was far from original. 

The suit, filed on May 31 in the United States District Court Eastern District of Pennsylvania, was brought by the estate of the late musician Randy California against the surviving members of Led Zeppelin and their record label. The copyright infringement case alleges that the Zeppelin song was taken from the single "Taurus" by the 1960s band Spirit, for whom California served as lead guitarist. 

"Late in 1968, a then new band named Led Zeppelin began touring in the United States, opening for Spirit," the suit states. "It was during this time that Jimmy Page, Led Zeppelin's guitarist, grew familiar with 'Taurus' and the rest of Spirit's catalog. Page stated in interviews that he found Spirit to be 'very good' and that the band's performances struck him 'on an emotional level.' " 

One of the causes of action for the suit is listed as "Falsification of Rock N' Roll History" and the typeface in the section headings of the filing resembles that used for Led Zeppelin album covers. According to claims in the suit, "Parts of 'Stairway to Heaven,' instantly recognizable to the music fans across the world, sound almost identical to significant portions of 'Taurus.' " 

The estate is seeking court ordered damages and writing credit for California, born Randy Craig Wolfe. Part of the defense includes a printed interview conducted with California prior to his death from drowning in 1997. In the 1997 interview with Listener Magazine, the guitarist claims that some of the music from "Stairway to Heaven" was taken from his group's song.  (End of story)

Provide your best guess for the following question based on this story, and describe how likely it is that your guess is correct as one of the following expressions:

Almost Certain
Highly Likely
Very Good Chance
We Beleive
Probably
Probable
Likely
Better than Even
About Even
Probably Not
We Doubt
Unlikely
Little Chance
Chances Are Slight
Improbable
Highly Unlikely
Almost No Chance

Give ONLY the guess and your confidence, no other words or explanation. For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>
Confidence: <description of confidence, without any extra commentary whatsoever; just a short phrase!>

Here are a few examples of questions and answers:

Question: When was the lawsuit filed?
Guess: May 31
Confidence: <appropriate level of confidence in this guess>

Question: Where was it filed?
Guess: in the United States District Court Eastern District of Pennsylvania
Confidence: <appropriate level of confidence in this guess>

Question: against who?
Guess: was brought by the estate of the late musician Randy California
Confidence: <appropriate level of confidence in this guess>

Question: Anyone else?
Guess: Yes
Confidence: <appropriate level of confidence in this guess>

Question: Who?
Guess: against the surviving members of Led Zeppelin and their record label
Confidence: <appropriate level of confidence in this guess>

Question: Why were they suing?
Guess: They claimed that the iconic Led Zeppelin song "Stairway to Heaven" was far from original
Confidence: <appropriate level of confidence in this guess>

Question: What song was it taken from?
Guess: the single "Taurus
Confidence: <appropriate level of confidence in this guess>

Question: What group did that song belong to?
Guess: Spirit
Confidence: <appropriate level of confidence in this guess>

Question: Was someone from Zeppelin previously in that group?
Guess: Yes
Confidence: <appropriate level of confidence in this guess>

Question: Who?
Guess: California
Confidence: <appropriate level of confidence in this guess>

Question: In what capacity?
Guess: lead guitarist
Confidence: <appropriate level of confidence in this guess>

Question: Did Zeppelin tour with Spirit?
Guess: Yes
Confidence: <appropriate level of confidence in this guess>

Now answer the following question in the same format.

Question: What year?

1968,