I saw Pete Seeger Sunday night, alive as you and me. They threw a birthday concert for him at Madison Square Garden. John Seeger, age 95, said from the stage that he expected his 90-year-old younger brother to make 100, which seems reasonable. Standing there, banjo off his shoulder, head thrown back, Pete looked eternal, in that pose so engraved in American memory it should be on a coin.

More than 40 artists, including John Mellencamp, Arlo Guthrie, Joan Baez and Bruce Springsteen, joined in a stage-clogging sing-along. When its four-plus hours are edited down to highlights, from “This Land Is Your Land” to “Goodnight, Irene,” it will be a PBS special made in pledge-week heaven.

I wonder, though, how many of the angry moments will survive.

Will we hear the Native American musicians pleading for support in their battle with Peabody Energy? Peabody is a giant strip-mining company that has been at the center of lawsuits by Southwestern tribes over drinking water and income from mineral rights.

Will we hear the praise for the Clean Water Act of 1972, or the acid remark from one of the Indians: “Ever since that man by the name of Hudson went up that river, it’s gone to hell.”