It Might Get Loud (2008)

This was a really fun documentary about three guitar legends: Jimmy Page of Led Zeppelin, The Edge of U2, and Jack White from the White Stripes and the Raconteurs.  So the 1960's, the 1980's, and the 2000's, all represented accounted for.
The film has at its center an unscripted Los Angeles sound stage jam session that brings the three generations of guitarists together, then branches off with personal profiles of each musician and their individual paths to developing their signature styles.
Page is the most private of the three, so his openness to the project is all the more remarkable as he invites the filmmakers into his London home to listen to his record collection and a side trip to the country house where the legendary "Stairway to Heaven"album was recorded.  He is very engaging and plays guitar throughout.
The Edge literally goes back to the Dublin high school where the U2 quartet formed as teenagers to highlight his musical journey, while a visit to his riverside studio reveals his unique, effects-laden guitar techniques and command of audio technology.
A trip to Jack White's  Tennessee home base reveals the origins of his minimalist, roots-oriented rock and blues style as he leads the filmmakers through his development as a respected musician and producer. It is just all out fun to watch and left me feeling kind of sad that it had to end.