WOW !!! .... Looking at your lists makes me feel that at 61 years of age, MY list is 'cutting' edge ...
Seriously, it's great to know that the 'Great American Songbook' is alive and well, ... but I am surprised that there's not more Billy Joel, Elton John, Angelo's guy Manilow, even Garth Brooks ... two songs of his that I've found very popular "The Dance" and "If Tomorrow Never Comes" ... I know UD said he didn't care for "IF Tomorrow.." , but I've found that crowds love it ... Also Clapton's "Wonderful Tonight", Joshua Kaddison's "Beautiful in My Eyes", Edwin McCain's "Could Not Ask For More", Van Morrison's "Have I told You Lately" (not Rod Stewart's version) ... Morrison's "Moondance" also makes a nice swing dance tune....
Speaking of Rod, as Scott Yee said, younger singers are using the "Great American Songbook" and introducing a whole new audience to it ... While I am not a fan of Rod Stewart's attempt at the standards, he will provide exposure to a new audience of listeners as well ... I remember when the movie "When Harry Met Sally" came out, I had young people ask if I knew any of Connick's 'new' music ... little did they realize I was playing it BEFORE he was!!!
t.