When Neil Young gets together with Crazy Horse, as he has since 1969’s “Everybody Knows This Is Nowhere,” the songs become something else. They’re jams that unfurl in long stretches, clanging and guttural one moment and then unexpectedly lyrical the next.

To give you a sense of just how unhurried Young and Crazy Horse were Monday night at TD Garden, consider the numbers: 13 songs spread over two hours and 15 minutes, with no intermission.