Bands you have seen more than once separated by (very) long spans of time

'79 show - that was a typo, not a senior moment

Outkast in 2001 and 2014. 2 of the greatest shows I've ever seen

Thought of another one that equals the Radiohead one. Saw Sexton Ming support Sonic Youth in 2000, and last year in a local pub.

This probably doesn't count but:
Beach Boys: 1977
Brian Wilson (doing Beach Boys material): 2005

Not that I saw either one, but if anyone saw Kate Bush's two live outings that would be a possible winner. 35 years.

McCartney in 89 and 201

Anvil at Monsters Of Rock in 1982 (rubbish), then again post-documentary in London, 2009 (still rubbish, went on a spare guest list spot). If they can't improve in 27 years then I'm calling it as a hopeless case.

my Dad saw Todd Rundgren three times, once in '75, once with Utopia in '84, then just now a couple months ago

he said the first one was excellent (first date with my Mom!), second one was alright (apparently the crowd wasn't into it), and the last one was the weirdest show he's ever seen

Next month I'll have an opportunity to see Clan of Xymox, almost 31 years since I first saw them touring for Medusa in '87. I haven't much cared for anything they've done in well over 25 years though, so will likely skip it.

Longest span I can think of is New Model Army in '89 and '09. Fantastic both times.

King Crimson in 1974 and last year. They were awfully good both times!