I've found what appears to an early demo tape of the vocals for Take It Easy. I'd never seen this before, it was only uploaded last week.
https://www.youtube.com/watch?v=n4u3-3aoU4c
The arrangement is more or less in place although there are a couple of differences from the album version, most notably towards the end of the song where Glenn uses some different lyrics over the 'oooh oooh' harmony parts.
An interesting video - I hope more 'lost' material from the early days will show up, not holding my breath though.