Long time, no post...

The doc makes it sound as if John Boylan, Linda's one-time manager, was the one who approached Glenn to join Linda's backing band, but in that book "Hotel California" and a recent JD Souther interview, make it sound as if it was in fact JD and Linda who asked Glenn on a night out to dinner...

J.D., to The New York Times , November, 2012:
Some of your most well-known songs were written for the Eagles. You and Glenn Frey were longtime musical partners before he co-founded the band — is that what led to you writing with those guys?

A.
Yeah. I met Don [Henley] through Glenn. Linda was my girlfriend then and she was always assembling odd combinations of people to back her, including me sometimes. Glenn and Don hit it off like a house afire — they’re both very ambitious, very talented guys. And they had a vision for a larger band. When Glenn and I broke up our little duo I just wanted to do what Jackson [Browne] was doing: I wanted to stay home by myself and write songs and get better at it. Linda was touring sporadically and she needed a backup band. One night we were all at a health food place in L.A. called the Nucleus Nuance – is that a ’70s name or what? I can remember being there with Linda and Glenn and trying to talk him into going on the road with her and putting a band together. It would solve everybody’s problems at once. And that’s the way it worked.

And this is Don, not Glenn, but I figured there can't be a "Linda and ...' in every guy's thread, so we'll shoehorn it in here. Sweet what good, close friends they all were for awhile...

From her 1980 Playboy interview:
PLAYBOY: Would you rather not be famous?

RONSTADT: Well, it's hard to go to the market and buy chicken, but I'm glad people think I'm cool and I understand a little of what the fame thing does to you. Take the Eagles, who have been my friends through the years. If I don't see them for six months or so, I begin to think of them as stars. I'll think about calling them, and then I'll think, Oh, they're so busy, they're such big stars, they don't want to hear from me. I called Don Henley the other day and he was so sweet. But we had this very businesslike conversation; I hadn't talked to him in months and I was kind of nervous and he responded in a businesslike way. He called back and he said, "What was that all about? How have you been?" And he came over with a bag of figs and we had a great time. I mean, the last people who should be falling for one another's press hypes are us.
I'd like to share figs with Don and Linda. Glenn can come, too