I honestly don't think this is a good argument, Nick, even though I agree with you that it's not as popular as Headache suggests.
Let's take a similar example - Sweetest Thing. Nobody's going to deny that it was a popular single. Back in the early 2000s when people at high school found out I was a huge U2 fan, it was usually the second or third song they'd mention they liked after Beautiful Day and maybe Elevation or Stuck in a Moment.
But Sweetest Thing's live track record is piss-poor. It showed up at 29 out of 113 Elevation Tour shows, or about 25% of them. Ordinary Love was at 11 out of 76 IE shows, or about 15%.
And look at other big hits that have surprisingly poor live records: HMTMKMKM not played once in the 2000s; WLCTT only played at four regular gigs in the last two decades, and even then as a tribute; hell, even All I Want Is You has only been played eighteen times in the last decade!
U2 play the shit out of some hits and singles, and neglect others. Ordinary Love, as a non-album single, is especially likely to experience neglect. The only songs not on a standard album to pass fifty performances are 11 O'clock Tick Tock (393, the massive outlier), Party Girl (192), Miss Sarajevo (190), HMTMKMKM (140), Invisible (81), and Boy/Girl (73). Of those six, three are from the band's early days when they had limited material and two appeared on a Best Of.
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Well all that's fair enough.
But my point was, that the song is not as popular as some of us are suggesting, based on data taken from online spins...and if it was really
that popular, they'd be playing it. If we use the data you posted, you could conclude that OL was about as popular as One, and twice as "popular" as Streets. Now we can quibble about how to define "popular", but I don't think any reasonable person would suggest OL has anywhere near that level of popularity. But I suppose they could do an experiment and delete Streets from the setlist and play OL and see what the reaction is.
So that's my point about them playing it live...the data suggesting the songs popularity is misleading, and U2 knows that I believe.
And your point about Sweetest Thing, for example, is well taken. But let's remember, U2 had an incredibly popular record they were supporting on the Elevation tour, buttressed by a smash hit, along with other well received songs. As far as I know, at the time of the I+E tour, OL was supposed to be U2's most popular song, even better received than anything from the record...or Invisible for that matter. Yet U2 chose not to make it a regular part of the set list. In spite of it being an Oscar nominated song, their first song in 5 years, and their supposedly best performing song at the time.
I don't want to make to much of this, my original point was just that the song isn't really that popular or well loved as some suppose, and that if it was U2 would be playing it. It's not like they didn't try, I just don't think many people care about hearing it.
Then again, maybe I'm completely out of touch with what people love these days. I'm told here that everyone in "real life" loves TBT and that it's doing quite well, whereas I think the song sucks. So maybe it's just me.