American Pop Flashback! Great Hits of the '60s & '70s is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV ...

For the group's Hackney Diamonds Tour, which kicked off in Houston in April, the band spent a month practicing 60 to 70 songs ...

That's up to $20,000 thanks to Jeannie in Manhattan. Please have your generosity doubled. On this double decade day of '60s & '70s music, what are your favorite double albums from the '60s & '70s?