I believe the Mams and Papas didn't actually release this. The Age Of Aquarius and Let the Sunshine in were both from the stage musical HAIR and released by The 5th dimension as a A and B side on 45rpm vinyl
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The song played on the Fancy Feast commercial is "Dream A Little Dream" recorded by The Mamas and The Papas and released on their album titled "The Papas and The Mamas" in 1968.
There is an explicit version of the "Fame Monster" album, but they do sell clean versions of it.
Loggins & Messina - On Stage
In the this is it album, your welcome:)
I have a version by Michael Buble, it was on a compilation album of versions of the song by many artists