As I recall, this was about a month after they finished recording LZ 1 and was done to work the kinks out for their upcoming "coming out". As to LZ's beginnings it was the recording of Beck's Bolero, as his first solo effort after leaving The Yardbirds in 1966, that was the seminal attempt. The recording session brought together a group of musicians, including Jimmy Page, Keith Moon, John Paul Jones, and Nicky Hopkins, who later agreed that the line up was a first attempt at what became Led Zeppelin. This was a major spark for a lot of what was to be for so many involved. Beck, Page, Hopkins, Jones, and Moon were pleased with the outcome of the recording session and there was talk of forming a working group and additional recordings. This led to the famous quip, "Yeah, it'll go down like a lead zeppelin", which Page later used, with a slight spelling change, for his new group. Page ascribed it to Moon, while Beck's and Led Zeppelin's later manager Peter Grant claimed Moon used the phrase "go down like a lead balloon", to which Entwistle added "more like a lead zeppelin". Entwistle, on the other hand, insists that he came up with the name independently along with the idea of using an image of "a Zeppelin going down in flames" for an album cover. Led Zeppelin biographer Keith Shadwick notes that forming an actual group at the time "was never a realistic option", due to existing contractual obligations.