As Mick Jagger performed a powerful version of “Angie” last week on stage in Canada, the beautiful, melodic piano lines weaving through the song were deftly being played by The Rolling Stones’ musical director and keyboard player Chuck Leavell. He’s been with the band 37 years and has also played with musical legends Eric Clapton, George Harrison, the Allman Brothers, John Mayer and countless others. Leavell’s passion for music is accompanied by a life spent as a steward of the environment. …It was when he married his wife Rose Lane 46 years ago, though, that he became a hands-on environmentalist, converting her family’s farm, which she inherited from her grandmother in the 1980s, into mostly forest land. It’s a model of sustainable forestry, growing yellow pine and other species. He’s written two books on the subject, “Forever Green: The History and Hope of the American Forest” and “Growing A Better America.”