In February it was 40 years ago that the ‘ Bridge over troubled water ‘ album was released. There’s a front-page article in Goldmine Magazine (February 26, 2010) and it has an interview with Art Garfunkel about the song.
When ‘ Bridge over troubled water ‘ was or was to be released Columbia Records had also a live album in mind. This information must have been made known to the Japanese CBS / Sony Corporation and when they released the ‘ Bridge’-album they put in the recording dates to the 11 tracks as follows:
All CBS/Sony albums contain very detailed recording information, which makes them very special. Already in 1969 they released a magnificent ‘ Greatest Hits’ album.
Paul Simon - 'Time it was...it was' 
Many of the recording dates on the Japanese issue bear little or no relation to the actual recording trajectory. B1, for example, recording began 11/18/68 at Columbia’s “Quonset Hut” studios in Nashville, finished several months later in New York. B6 supposedly was recorded at a live concert in Ames, IA – the only live track on the entire LP. The “recording dates” cited appear to be concert dates that were filmed for a proposed TV special, Songs For America, that they were to appear in.
Where did you find out that recording sessions for BOTW started in Nashville? I must have missed reading this info somewhere. Regarding the info on the Japanes release of BOYW, I was informed that Japanese were said that the next S&G album would be a live album and they received the info that went along with it. I have other (fold-out) Japanese albums of BOTW in which that info was deleted.
I still would be interested in the complete live shows they recorded in 1968/1968. They really do exist on tape, but ares shelved. Such a shame.
There’ve been books written about how S&G’s “The Boxer” started out recorded in Nashville and, by various accounts, took some 100 hours to complete for a 5-minute, 10-second song. Given how meticulously Simon worked at this juncture, no way any of the tracks could’ve been done in one day in a concert setting by this point. I’d not doubt that much of their live recordings have been, to date, unreleased.